18 results on '"McKinnon, Kevin A."'
Search Results
2. Data-driven Discovery of Diffuse Interstellar Bands with APOGEE Spectra
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McKinnon, Kevin A., Ness, Melissa K., Rockosi, Constance M., and Guhathakurta, Puragra
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics ,Statistics - Applications - Abstract
Data-driven models of stellar spectra are useful tools to study non-stellar information, such as the Diffuse Interstellar Bands (DIBs) caused by intervening interstellar material. Using $\sim 55000$ spectra of $\sim 17000$ red clump stars from the APOGEE DR16 dataset, we create 2nd order polynomial models of the continuum-normalized flux as a function of stellar parameters ($T_{eff}$, $\log g$, [Fe/H], [$\alpha$/Fe], and Age). The model and data show good agreement within uncertainties across the APOGEE wavelength range, although many regions reveal residuals that are not in the stellar rest-frame. We show that many of these residual features -- having average extrema at the level of $\sim3\%$ in stellar flux on average -- can be attributed to incompletely-removed spectral lines from the Earth's atmosphere and DIBs from the interstellar medium (ISM). After removing most of the remaining contamination from the Earth's sky, we identify 84 absorption features not seen in unreddened sightlights that have $<50\%$ probability of being noise artifacts -- with 25 of these features having $<5\%$ probability of being noise artifacts -- including all 10 previously-known DIBs in the APOGEE wavelength range. Because many of these features occur in the wavelength windows that APOGEE uses to measure chemical abundances, characterization and removal of this non-stellar contamination is an important step in reaching the precision required for chemical tagging experiments. Proper characterization of these features will benefit Galactic ISM science and the currently-ongoing Milky Way Mapper program of SDSS-V, which relies on the APOGEE spectrograph., Comment: 31 pages, 20 figures, 4 tables
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- 2023
3. RomAndromeda: The Roman Survey of the Andromeda Halo
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Dey, Arjun, Najita, Joan, Filion, Carrie, Han, Jiwon Jesse, Pearson, Sarah, Wyse, Rosemary, Thob, Adrien C. R., Anguiano, Borja, Apfel, Miranda, Arnaboldi, Magda, Bell, Eric F., Silva, Leandro Beraldo e, Besla, Gurtina, Bhattacharya, Aparajito, Bhattacharya, Souradeep, Chandra, Vedant, Choi, Yumi, Collins, Michelle L. M., Cunningham, Emily C., Dalcanton, Julianne J., Escala, Ivanna, Foote, Hayden R., Ferguson, Annette M. N., Gibson, Benjamin J., Gnedin, Oleg Y., Guhathakurta, Puragra, Hawkins, Keith, Horta, Danny, Ibata, Rodrigo, Kallivayalil, Nitya, Koch, Eric W., Koposov, Sergey, Lewis, Geraint F., Macri, Lucas, McKinnon, Kevin A., Nidever, David L., Olsen, Knut A. G., Patel, Ekta, Petersen, Michael S., Petric, Andreea, Price-Whelan, Adrian M., Rich, R. Michael, Riley, Alexander H., Saha, Abhijit, Sanderson, Robyn E., Sharma, Sanjib, Sohn, Sangmo Tony, Soraisam, Monika D., Steinmetz, Matthias, Valluri, Monica, Vivas, A. Katherina, Williams, Benjamin F., and Wojno, J. Leigh
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Astrophysics - Astrophysics of Galaxies - Abstract
As our nearest large neighbor, the Andromeda Galaxy provides a unique laboratory for investigating galaxy formation and the distribution and substructure properties of dark matter in a Milky Way-like galaxy. Here, we propose an initial 2-epoch ($\Delta t\approx 5$yr), 2-band Roman survey of the entire halo of Andromeda, covering 500 square degrees, which will detect nearly every red giant star in the halo (10$\sigma$ detection in F146, F062 of 26.5, 26.1AB mag respectively) and yield proper motions to $\sim$25 microarcsec/year (i.e., $\sim$90 km/s) for all stars brighter than F146 $\approx 23.6$ AB mag (i.e., reaching the red clump stars in the Andromeda halo). This survey will yield (through averaging) high-fidelity proper motions for all satellites and compact substructures in the Andromeda halo and will enable statistical searches for clusters in chemo-dynamical space. Adding a third epoch during the extended mission will improve these proper motions by $\sim t^{-1.5}$, to $\approx 11$ km/s, but this requires obtaining the first epoch in Year 1 of Roman operations. In combination with ongoing and imminent spectroscopic campaigns with ground-based telescopes, this Roman survey has the potential to yield full 3-d space motions of $>$100,000 stars in the Andromeda halo, including (by combining individual measurements) robust space motions of its entire globular cluster and most of its dwarf galaxy satellite populations. It will also identify high-velocity stars in Andromeda, providing unique information on the processes that create this population. These data offer a unique opportunity to study the immigration history, halo formation, and underlying dark matter scaffolding of a galaxy other than our own., Comment: Submitted in response to the call for Roman Space Telescope Core Community Survey white papers
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- 2023
4. HALO7D III: Chemical Abundances of Milky Way Halo Stars from Medium Resolution Spectra
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McKinnon, Kevin A., Cunningham, Emily C., Rockosi, Constance M., Guhathakurta, Puragra, Escala, Ivanna, Kirby, Evan N., and Deason, Alis J.
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Astrophysics - Astrophysics of Galaxies - Abstract
The Halo Assembly in Lambda Cold Dark Matter: Observations in 7 Dimensions (HALO7D) survey measures the kinematics and chemical properties of stars in the Milky Way (MW) stellar halo to learn about the formation of our Galaxy. HALO7D consists of Keck II/DEIMOS spectroscopy and Hubble Space Telescope-measured proper motions of MW halo main sequence turn-off (MSTO) stars in the four CANDELS fields. HALO7D consists of deep pencil beams, making it complementary to other contemporary wide-field surveys. We present the [Fe/H] and [$\alpha$/Fe] abundances for 113 HALO7D stars in the Galactocentric radial range of $\sim 10-40$ kpc. Using the full 7D chemodynamical data (3D positions, 3D velocities, and abundances) of HALO7D, we measure the velocity anisotropy, $\beta$, of the halo velocity ellipsoid for each field and for different metallicity-binned subsamples. We find that two of the four fields have stars on very radial orbits, while the remaining two have stars on more isotropic orbits. Separating the stars into high, mid, and low [Fe/H] bins at $-2.2$ dex and $-1.1$ dex for each field separately, we find differences in the anisotropies between the fields and between the bins; some fields appear dominated by radial orbits in all bins while other fields show variation between the [Fe/H] bins. These chemodynamical differences are evidence that the HALO7D fields have different fractional contributions from the progenitors that built up the MW stellar halo. Our results highlight the additional information that is available on smaller spatial scales when compared to results from a spherical average of the stellar halo., Comment: 34 pages, 16 figures
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- 2023
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5. Optical Rebrightening of Extragalactic Transients from the Zwicky Transient Facility
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Soraisam, Monika, Matheson, Thomas, Lee, Chien-Hsiu, Saha, Abhijit, Narayan, Gautham, Wolf, Nicholas, Scott, Adam, Figuereo, Stephanie, Nunuez, Rafael, McKinnon, Kevin, Guhathakurta, Puragra, Brink, Thomas, Filippenko, Alexei, and Smith, Nathan
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Ongoing large-scale optical time-domain surveys, such as the Zwicky Transient Facility (ZTF), are producing alerts at unprecedented rates. Analysis of transient sources has so far followed two distinct paths: archival analysis of data on transient sources at a time when they are no longer observable and real-time analysis at the time when the sources are first detected. The latter is the realm of alert brokers such as the Arizona-NOIRLab Temporal Analysis and Response to Events System (ANTARES). In this paper, we synthesize the two analysis paths and present a first systematic study of archival alert-broker data, focusing on extragalactic transients with multipeaked light curves identified in the ANTARES archive of ZTF alerts. Our analysis yields a sample of 37 such sources, including core-collapse supernovae (with two analogs of iPTF14hls), thermonuclear supernovae interacting with their surrounding circumstellar medium, tidal disruption events, luminous blue variables, and as yet unclassified objects. A large fraction of the identified sources is currently active, warranting allocation of follow-up resources in the immediate future to further constrain their nature and the physical processes at work., Comment: Accepted for publication in ApJ Letters
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- 2022
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6. The homogeneity of the star forming environment of the Milky Way disk over time
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Ness, Melissa K., Wheeler, Adam J., McKinnon, Kevin, Horta, Danny, Casey, Andrew R., Cunningham, Emily C., and Price-Whelan, Adrian M.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Stellar abundances and ages afford the means to link chemical enrichment to galactic formation. In the Milky Way, individual element abundances show tight correlations with age, which vary in slope across ([Fe/H]-[$\alpha$/Fe]). Here, we step from characterising abundances as measures of age, to understanding how abundances trace properties of stellar birth-environment in the disk over time. Using measurements from $\sim$27,000 APOGEE stars (R=22,500, SNR$>$200), we build simple local linear models to predict a sample of elements (X = Si, O, Ca, Ti, Ni, Al, Mn, Cr) using (Fe, Mg) abundances alone, as fiducial tracers of supernovae production channels. Given [Fe/H] and [Mg/H], we predict these elements, [X/H], to about double the uncertainty of their measurements. The intrinsic dispersion, after subtracting measurement errors in quadrature is $\approx 0.015-0.04$~dex. The residuals of the prediction (measurement $-$ model) for each element demonstrate that each element has an individual link to birth properties at fixed (Fe, Mg). Residuals from primarily massive-star supernovae (i.e. Si, O, Al) partially correlate with guiding radius. Residuals from primarily supernovae Ia (i.e. Mn, Ni) partially correlate with age. A fraction of the intrinsic scatter that persists at fixed (Fe, Mg), however, after accounting for correlations, does not appear to further discriminate between birth properties that can be traced with present-day measurements. Presumably, this is because the residuals are also, in part, a measure of the typical (in)-homogeneity of the disk's stellar birth environments, previously inferred only using open-cluster systems. Our study implies at fixed birth radius and time, there is a median scatter of $\approx 0.01-0.015$ dex in elements generated in supernovae sources., Comment: submitted to ApJ, 16 pages, 12 figures
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- 2021
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7. Fast, Slow, Early, Late: Quenching Massive Galaxies at z~0.8
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Tacchella, Sandro, Conroy, Charlie, Faber, S. M., Johnson, Benjamin D., Leja, Joel, Barro, Guillermo, Cunningham, Emily C., Deason, Alis J., Guhathakurta, Puragra, Guo, Yicheng, Hernquist, Lars, Koo, David C., McKinnon, Kevin, Rockosi, Constance M., Speagle, Joshua S., van Dokkum, Pieter, and Yesuf, Hassen M.
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Astrophysics - Astrophysics of Galaxies - Abstract
We investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at $\langle z_{\rm obs} \rangle=0.8$ with deep Keck/DEIMOS rest-frame optical spectroscopy (HALO7D survey). With the fully Bayesian framework Prospector, we simultaneously fit the spectroscopic and photometric data with an advanced physical model (including non-parametric star-formation histories, emission lines, variable dust attenuation law, and dust and AGN emission) together with an uncertainty and outlier model. We show that both spectroscopy and photometry are needed to break the dust-age-metallicity degeneracy. We find a large diversity of star-formation histories: although the most massive ($M_{\star}>2\times10^{11}~M_{\odot}$) galaxies formed the earliest (formation redshift of $z_{\rm f}\approx5-10$ with a short star-formation timescale of $\tau_{\rm SF}\lesssim1~\mathrm{Gyr}$), lower-mass galaxies have a wide range of formation redshifts, leading to only a weak trend of $z_{\rm f}$ with $M_{\star}$. Interestingly, several low-mass galaxies with have formation redshifts of $z_{\rm f}\approx5-8$. Star-forming galaxies evolve about the star-forming main sequence, crossing the ridgeline several times in their past. Quiescent galaxies show a wide range and continuous distribution of quenching timescales ($\tau_{\rm quench}\approx0-5~\mathrm{Gyr}$) with a median of $\langle\tau_{\rm quench}\rangle=1.0_{-0.9}^{+0.8}~\mathrm{Gyr}$ and of quenching epochs of $z_{\rm quench}\approx0.8-5.0$ ($\langle z_{\rm quench}\rangle=1.3_{-0.4}^{+0.7}$). This large diversity of quenching timescales and epochs points toward a combination of internal and external quenching mechanisms. In our sample, rejuvenation and "late bloomers" are uncommon. In summary, our analysis supports the "grow & quench" framework and is consistent with a wide and continuously-populated diversity of quenching timescales., Comment: 30 pages, 12 figures + appendix, accepted by ApJ
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- 2021
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8. Updated Constraints on Asteroid-Mass Primordial Black Holes as Dark Matter
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Smyth, Nolan, Profumo, Stefano, English, Samuel, Jeltema, Tesla, McKinnon, Kevin, and Guhathakurta, Puragra
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Astrophysics - Cosmology and Nongalactic Astrophysics ,High Energy Physics - Theory - Abstract
Microlensing of stars places significant constraints on sub-planetary-mass compact objects, including primordial black holes, as dark matter candidates. As the lens' Einstein radius in the source plane becomes comparable to the size of the light source, however, source amplification is strongly suppressed, making it challenging to constrain lenses with a mass at or below $10^{-10}$ solar masses, i.e. asteroid-mass objects. Current constraints, using Subaru HSC observations of M31, assume a fixed source size of one solar radius. Here we point out that the actual stars in M31 bright enough to be used for microlensing are typically much larger. We correct the HSC constraints by constructing a source size distribution based on the M31 PHAT survey and on a synthetic stellar catalogue, and by correspondingly weighing the finite-size source effects. We find that the actual HSC constraints are weaker by up to almost three orders of magnitude in some cases, broadening the range of masses for which primordial black holes can be the totality of the cosmological dark matter by almost one order of magnitude., Comment: 8 pages, 6 figures, accepted to PRD. Moved supplemental section into main body
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- 2019
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9. Constraining Type Iax Supernova Progenitor Systems with Stellar Population Aging
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Takaro, Tyler, Foley, Ryan J., McCully, Curtis, Fong, Wen-fai, Jha, Saurabh W., Narayan, Gautham, Rest, Armin, Stritzinger, Maximilian, and McKinnon, Kevin
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Type Iax supernovae (SNe~Iax) are the most common class of peculiar SNe. While they are thought to be thermonuclear white-dwarf (WD) SNe, SNe~Iax are observationally similar to, but distinct from SNe~Ia. Unlike SNe~Ia, where roughly 30\% occur in early-type galaxies, only one SN~Iax has been discovered in an early-type galaxy, suggesting a relatively short delay time and a distinct progenitor system. Furthermore, one SN~Iax progenitor system has been detected in pre-explosion images with its properties consistent with either of two models: a short-lived (<100 Myr) progenitor system consisting of a WD primary and a He-star companion, or a singular Wolf-Rayet progenitor star. Using deep \textit{Hubble Space Telescope} images of nine nearby SN~Iax host galaxies, we measure the properties of stars within 200 pc of the SN position. The ages of local stars, some of which formed with the SN progenitor system, can constrain the time between star formation and SN, known as the delay time. We compare the local stellar properties to synthetic photometry of single-stellar populations, fitting to a range of possible delay times for each SN. With this sample, we uniquely constrain the delay-time distribution for SNe~Iax, with a median and $1-\sigma$ confidence interval delay time of $63_{- 15}^{+ 58} \times 10^{6}$ years. The measured delay-time distribution provides an excellent constraint on the progenitor system for the class, indicating a preference for a WD progenitor system over a Wolf-Rayet progenitor star., Comment: 18 pages, 11 figures
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- 2019
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10. Updated constraints on asteroid-mass primordial black holes as dark matter
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Smyth, Nolan, Profumo, Stefano, English, Samuel, Jeltema, Tesla, McKinnon, Kevin, and Guhathakurta, Puragra
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Space Sciences ,Astronomical Sciences ,Physical Sciences ,astro-ph.CO ,hep-th ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Quantum Physics ,Nuclear & Particles Physics ,Mathematical physics ,Astronomical sciences ,Particle and high energy physics - Abstract
Microlensing of stars places significant constraints on sub-planetary-masscompact objects, including primordial black holes, as dark matter candidates.As the lens' Einstein radius in the source plane becomes comparable to the sizeof the light source, however, source amplification is strongly suppressed,making it challenging to constrain lenses with a mass at or below $10^{-10}$solar masses, i.e. asteroid-mass objects. Current constraints, using Subaru HSCobservations of M31, assume a fixed source size of one solar radius. Here wepoint out that the actual stars in M31 bright enough to be used formicrolensing are typically much larger. We correct the HSC constraints byconstructing a source size distribution based on the M31 PHAT survey and on asynthetic stellar catalogue, and by correspondingly weighing the finite-sizesource effects. We find that the actual HSC constraints are weaker by up toalmost three orders of magnitude in some cases, broadening the range of massesfor which primordial black holes can be the totality of the cosmological darkmatter by almost one order of magnitude.
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- 2020
11. BP3M: Bayesian Positions, Parallaxes, and Proper Motions Derived from the Hubble Space Telescope and Gaia Data.
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McKinnon, Kevin A., del Pino, Andrés, Rockosi, Constance M., Apfel, Miranda, Guhathakurta, Puragra, van der Marel, Roeland P., Bennet, Paul, Fardal, Mark A., Libralato, Mattia, Sohn, Sangmo Tony, Vitral, Eduardo, and Watkins, Laura L.
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MILKY Way , *PARALLAX , *ELLIPTICAL galaxies , *DWARF galaxies , *SPACE telescopes , *ASTROMETRY - Abstract
We present a hierarchical Bayesian pipeline, BP3M, that measures positions, parallaxes, and proper motions (PMs) for cross-matched sources between Hubble Space Telescope (HST) images and Gaia—even for sparse fields (N * < 10 per image)—expanding from the recent GaiaHub tool. This technique uses Gaia-measured astrometry as priors to predict the locations of sources in HST images, and is therefore able to put the HST images onto a global reference frame without the use of background galaxies/QSOs. Testing our publicly available code in the Fornax and Draco dwarf spheroidal galaxies, we measure PMs that are a median of 8–13 times more precise than Gaia DR3 alone for 20.5 < G < 21 mag. We are able to explore the effect of observation strategies on BP3M astrometry using synthetic data, finding an optimal strategy to improve parallax and position precision at no cost to the PM uncertainty. Using 1619 HST images in the sparse COSMOS field (median nine Gaia sources per HST image), we measure BP3M PMs for 2640 unique sources in the 16 < G < 21.5 mag range, 25% of which have no Gaia PMs; the median BP3M PM uncertainty for 20.25 < G < 20.75 mag sources is 0.44 mas yr−1 compared to 1.03 mas yr−1 from Gaia, while the median BP3M PM uncertainty for sources without Gaia-measured PMs (20.75 < G < 21.5 mag) is 1.16 mas yr−1. The statistics that underpin the BP3M pipeline are a generalized way of combining position measurements from different images, epochs, and telescopes, which allows information to be shared between surveys and archives to achieve higher astrometric precision than that from each catalog alone. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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12. Measuring Astrophysical Parameters from Resolved Stellar Populations in the Milky Way using Applied Statistics
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McKinnon, Kevin Andrew
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Astronomy ,Astrophysics ,Statistics ,Astrostatistics ,Galactic archeology ,Milky Way - Abstract
Stars, as key building blocks of galaxies, retain information about the conditions in which they formed and can therefore be used to trace galaxy formation and evolution. Using data from the HALO7D survey, we measure chemical abundances from stellar spectra of main sequence turn-off stars in the Milky Way (MW) stellar halo. From these abundances, in combination with previously-measured velocities, we show that the chemodynamical distributions of stars along four individual lines-of-sight (LOS) are statistically different from one another, in agreement with a growing body of evidence that suggests the the MW stellar halo is not as well-mixed as often assumed. With the goal of improving our understanding of the MW merger's history by expanding precise chemodynamics measurements to additional LOS in the Galaxy, we develop a technique for measuring precise proper motions (PMs) of stars in sparse fields by combining archival Hubble Space Telescope (HST) images with Gaia data. The resulting PMs are a median of 2.6 times more precise than Gaia alone in sparse HST images of COSMOS, and we recover PMs for the ~25% of sources that are too faint for Gaia to constrain. This technique also enables us to simulate future missions, such as the Roman Space Telescope. With these simulated observations, we design an observation strategy that significantly improves parallax precision at no cost to PM precision. Chemical tagging experiments are hindered by unexpected, non-stellar signatures in spectra, some of which can originate in the interstellar medium (ISM). To increase the scientific potential of the APOGEE spectrograph, we present a detailed accounting of light in APOGEE stellar spectra using a data-driven model of red clump stars. These near-infrared, H-band spectra are well-described by this model, though their residuals reveal a wealth of information about the intervening gas and dust in the ISM. We characterize the non-stellar light to measure as many as 84 Diffuse Interstellar Bands in the APOGEE wavelength range, ~74 of which were previously unknown, and show that these ISM-based features are likely impacting stellar chemical abundance measurements.
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- 2023
13. Data-driven Discovery of Diffuse Interstellar Bands with APOGEE Spectra
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McKinnon, Kevin A., primary, Ness, Melissa K., additional, Rockosi, Constance M., additional, and Guhathakurta, Puragra, additional
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- 2024
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14. The SALVATION Project: A Red Nova in M31 and Other Highlights
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Nunez, Rafael, Figuereo, Stephanie, Soraisam, Monika, McKinnon, Kevin, Guhathakurta, Puragra, Kimura, Stefan, Lee, Chien-Hsiu, and Aleo, Patrick
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Eruptions/outbursts ,Novae, obscured transients - Abstract
The SALVATION (Spectroscopic Analysis of Luminous Variables and Transients in our Neighbor) project, which started in the fall of 2019, uses Lick Observatory’s Shane 3-m telescope and Kast double spectrograph in cadence and target-of-opportunity modes to carry out visible (~4000–9000 Angstrom) spectroscopic follow up of variable stars and transients identified by the ANTARES community alert broker from the real-time data stream of the Zwicky Transient Factory. Most of these sources are in the Andromeda galaxy (M31) or along the line-of-sight to it; during times of the night when M31 is inaccessible, we obtain spectra of transients along other lines of sight. We are carrying out routine spectroscopic monitoring of ~50 luminous variable stars, and have obtained spectra of several tens of transients to date, many of which have been reported in rapid response via Astronomer’s Telegrams. In fall of 2021, we spectroscopically classified a transient, AT2021tdu, identified from the community alert broker ANTARES as a red nova in M31. Red novae and their luminous counterparts are thought to be the result of stellar mergers and occupy a particularly sparse portion of the transient gap (the gap between classical novae and supernovae) with only a few published examples, three of which are recorded in M31, making this the discovery of a rare object. Due to the initial preference from observers of finding the most luminous and common stellar explosions, groups of transients between these parameters, including red novae like AT2021tdu, have been left unobserved. The Nancy Grace Roman Space Telescope will grant near infrared multi-band imaging to analyze the rarely documented IR emissions that are characteristic of red novae.We are currently collecting photometric and spectroscopic data of AT2021tdu to report more information on red novae and improve their characterization.
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- 2022
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15. Optical Rebrightening of Extragalactic Transients from the Zwicky Transient Facility
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Soraisam, Monika, primary, Matheson, Thomas, additional, Lee, Chien-Hsiu, additional, Saha, Abhijit, additional, Narayan, Gautham, additional, Wolf, Nicholas, additional, Scott, Adam, additional, Figuereo, Stephanie, additional, Nuñez, Rafael, additional, McKinnon, Kevin, additional, Guhathakurta, Puragra, additional, Brink, Thomas G., additional, Filippenko, Alexei V., additional, and Smith, Nathan, additional
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- 2022
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16. Fast, Slow, Early, Late: Quenching Massive Galaxies at z ∼ 0.8
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Tacchella, Sandro, primary, Conroy, Charlie, additional, Faber, S. M., additional, Johnson, Benjamin D., additional, Leja, Joel, additional, Barro, Guillermo, additional, Cunningham, Emily C., additional, Deason, Alis J., additional, Guhathakurta, Puragra, additional, Guo, Yicheng, additional, Hernquist, Lars, additional, Koo, David C., additional, McKinnon, Kevin, additional, Rockosi, Constance M., additional, Speagle, Joshua S., additional, van Dokkum, Pieter, additional, and Yesuf, Hassen M., additional
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- 2022
- Full Text
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17. The Homogeneity of the Star-forming Environment of the Milky Way Disk over Time
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Ness, Melissa K., primary, Wheeler, Adam J., additional, McKinnon, Kevin, additional, Horta, Danny, additional, Casey, Andrew R., additional, Cunningham, Emily C., additional, and Price-Whelan, Adrian M, additional
- Published
- 2022
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18. Constraining Type Iax supernova progenitor systems with stellar population age dating
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Takaro, Tyler, primary, Foley, Ryan J, additional, McCully, Curtis, additional, Fong, Wen-fai, additional, Jha, Saurabh W, additional, Narayan, Gautham, additional, Rest, Armin, additional, Stritzinger, Maximilian, additional, and McKinnon, Kevin, additional
- Published
- 2020
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