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7 results on '"Crane, Jeffrey D."'

1. Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions* * This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

Author

Laliotis, Katherine, Burt, Jennifer A, Mamajek, Eric E, Li, Zhexing, Perdelwitz, Volker, Zhao, Jinglin, Butler, R Paul, Holden, Bradford, Rosenthal, Lee, Fulton, BJ, Feng, Fabo, Kane, Stephen R, Bailey, Jeremy, Carter, Brad, Crane, Jeffrey D, Furlan, Elise, Gnilka, Crystal L, Howell, Steve B, Laughlin, Gregory, Shectman, Stephen A, Teske, Johanna K, Tinney, CG, Vogt, Steven S, Wang, Sharon Xuesong, and Wittenmyer, Robert A

Subjects
Space Sciences, Astronomical Sciences, Physical Sciences, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics
Abstract

Directly imaging temperate rocky planets orbiting nearby, Sun-like stars with a 6 m class IR/O/UV space telescope, recently dubbed the Habitable Worlds Observatory, is a high-priority goal of the Astro2020 Decadal Survey. To prepare for future direct imaging (DI) surveys, the list of potential targets should be thoroughly vetted to maximize efficiency and scientific yield. We present an analysis of archival radial velocity data for southern stars from the NASA/NSF Extreme Precision Radial Velocity (EPRV) Working Group’s list of high-priority target stars for future DI missions (drawn from the HabEx, LUVOIR, and Starshade Rendezvous studies). For each star, we constrain the region of companion mass and period parameter space we are already sensitive to based on the observational baseline, sampling, and precision of the archival radial velocity (RV) data. Additionally, for some of the targets, we report new estimates of magnetic activity cycle periods, rotation periods, improved orbital parameters for previously known exoplanets, and new candidate planet signals that require further vetting or observations to confirm. Our results show that for many of these stars we are not yet sensitive to even Saturn-mass planets in the habitable zone, let alone smaller planets, highlighting the need for future EPRV vetting efforts before the launch of a DI mission. We present evidence that the candidate temperate super-Earth exoplanet HD 85512b is most likely due to the star’s rotation, and report an RV acceleration for δ Pav that supports the existence of a distant giant planet previously inferred from astrometry.

Published
2023

2. The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data

Author

Abdurro’uf, Accetta, Katherine, Aerts, Conny, Aguirre, Víctor Silva, Ahumada, Romina, Ajgaonkar, Nikhil, Ak, N Filiz, Alam, Shadab, Prieto, Carlos Allende, Almeida, Andrés, Anders, Friedrich, Anderson, Scott F, Andrews, Brett H, Anguiano, Borja, Aquino-Ortíz, Erik, Aragón-Salamanca, Alfonso, Argudo-Fernández, Maria, Ata, Metin, Aubert, Marie, Avila-Reese, Vladimir, Badenes, Carles, Barbá, Rodolfo H, Barger, Kat, Barrera-Ballesteros, Jorge K, Beaton, Rachael L, Beers, Timothy C, Belfiore, Francesco, Bender, Chad F, Bernardi, Mariangela, Bershady, Matthew A, Beutler, Florian, Bidin, Christian Moni, Bird, Jonathan C, Bizyaev, Dmitry, Blanc, Guillermo A, Blanton, Michael R, Boardman, Nicholas Fraser, Bolton, Adam S, Boquien, Médéric, Borissova, Jura, Bovy, Jo, Brandt, WN, Brown, Jordan, Brownstein, Joel R, Brusa, Marcella, Buchner, Johannes, Bundy, Kevin, Burchett, Joseph N, Bureau, Martin, Burgasser, Adam, Cabang, Tuesday K, Campbell, Stephanie, Cappellari, Michele, Carlberg, Joleen K, Wanderley, Fábio Carneiro, Carrera, Ricardo, Cash, Jennifer, Chen, Yan-Ping, Chen, Wei-Huai, Cherinka, Brian, Chiappini, Cristina, Choi, Peter Doohyun, Chojnowski, S Drew, Chung, Haeun, Clerc, Nicolas, Cohen, Roger E, Comerford, Julia M, Comparat, Johan, da Costa, Luiz, Covey, Kevin, Crane, Jeffrey D, Cruz-Gonzalez, Irene, Culhane, Connor, Cunha, Katia, Dai, Y Sophia, Damke, Guillermo, Darling, Jeremy, Davidson, James W, Davies, Roger, Dawson, Kyle, De Lee, Nathan, Diamond-Stanic, Aleksandar M, Cano-Díaz, Mariana, Sánchez, Helena Domínguez, Donor, John, Duckworth, Chris, Dwelly, Tom, Eisenstein, Daniel J, Elsworth, Yvonne P, Emsellem, Eric, Eracleous, Mike, Escoffier, Stephanie, Fan, Xiaohui, Farr, Emily, Feng, Shuai, Fernández-Trincado, José G, Feuillet, Diane, Filipp, Andreas, Fillingham, Sean P, and Frinchaboy, Peter M

Subjects
Astronomical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal of surveying over 10,000 nearby galaxies. The complete release of the MaNGA Stellar Library accompanies this data, providing observations of almost 30,000 stars through the MaNGA instrument during bright time. DR17 also contains the complete release of the Apache Point Observatory Galactic Evolution Experiment 2 survey that publicly releases infrared spectra of over 650,000 stars. The main sample from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), as well as the subsurvey Time Domain Spectroscopic Survey data were fully released in DR16. New single-fiber optical spectroscopy released in DR17 is from the SPectroscipic IDentification of ERosita Survey subsurvey and the eBOSS-RM program. Along with the primary data sets, DR17 includes 25 new or updated value-added catalogs. This paper concludes the release of SDSS-IV survey data. SDSS continues into its fifth phase with observations already underway for the Milky Way Mapper, Local Volume Mapper, and Black Hole Mapper surveys.

Published
2022

3. Physical Parameters of the Multiplanet Systems HD 106315 and GJ 9827* *Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. † †This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.

Author

Kosiarek, Molly R, Berardo, David A, Crossfield, Ian JM, Laguna, Cesar, Piaulet, Caroline, Murphy, Joseph M Akana, Howell, Steve B, Henry, Gregory W, Isaacson, Howard, Fulton, Benjamin, Weiss, Lauren M, Petigura, Erik A, Behmard, Aida, Hirsch, Lea A, Teske, Johanna, Burt, Jennifer A, Mills, Sean M, Chontos, Ashley, Močnik, Teo, Howard, Andrew W, Werner, Michael, Livingston, John H, Krick, Jessica, Beichman, Charles, Gorjian, Varoujan, Kreidberg, Laura, Morley, Caroline, Christiansen, Jessie L, Morales, Farisa Y, Scott, Nicholas J, Crane, Jeffrey D, Wang, Sharon Xuesong, Shectman, Stephen A, Rosenthal, Lee J, Grunblatt, Samuel K, Rubenzahl, Ryan A, Dalba, Paul A, Giacalone, Steven, Villanueva, Chiara Dane, Liu, Qingtian, Dai, Fei, Hill, Michelle L, Rice, Malena, Kane, Stephen R, and Mayo, Andrew W

Subjects
Radial velocity, Exoplanets, Mini Neptunes, Transit photometry, Gaussian Processes regression, Super Earths, astro-ph.EP, Astronomical and Space Sciences, Astronomy & Astrophysics
Abstract

HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets' ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectroscopy. Through a multiyear high-cadence observing campaign with Keck/High Resolution Echelle Spectrometer and Magellan/Planet Finder Spectrograph, we improved the planets' mass measurements in anticipation of Hubble Space Telescope transmission spectroscopy. For GJ 9827, we modeled activity-induced radial velocity signals with a Gaussian process informed by the Calcium II H&K lines in order to more accurately model the effect of stellar noise on our data. We measured planet masses of Mb = 4.87 ± 0.37 M⊕, Mc = 1.92 ± 0.49 M⊕, and Md = 3.42 ± 0.62 M⊕. For HD 106315, we found that such activity radial velocity decorrelation was not effective due to the reduced presence of spots and speculate that this may extend to other hot stars as well (Teff > 6200 K). We measured planet masses of Mb = 10.5 ± 3.1 M⊕ and Mc = 12.0 ± 3.8 M⊕. We investigated all of the planets' compositions through comparison of their masses and radii to a range of interior models. GJ 9827 b and GJ 9827 c are both consistent with a 50/50 rock-iron composition, GJ 9827 d and HD 106315 b both require additional volatiles and are consistent with moderate amounts of water or hydrogen/helium, and HD 106315 c is consistent with a ∼10% hydrogen/helium envelope surrounding an Earth-like rock and iron core.

Published
2021

4. The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra

Author

Ahumada, Romina, Prieto, Carlos Allende, Almeida, Andrés, Anders, Friedrich, Anderson, Scott F, Andrews, Brett H, Anguiano, Borja, Arcodia, Riccardo, Armengaud, Eric, Aubert, Marie, Avila, Santiago, Avila-Reese, Vladimir, Badenes, Carles, Balland, Christophe, Barger, Kat, Barrera-Ballesteros, Jorge K, Basu, Sarbani, Bautista, Julian, Beaton, Rachael L, Beers, Timothy C, Benavides, B Izamar T, Bender, Chad F, Bernardi, Mariangela, Bershady, Matthew, Beutler, Florian, Bidin, Christian Moni, Bird, Jonathan, Bizyaev, Dmitry, Blanc, Guillermo A, Blanton, Michael R, Boquien, Médéric, Borissova, Jura, Bovy, Jo, Brandt, WN, Brinkmann, Jonathan, Brownstein, Joel R, Bundy, Kevin, Bureau, Martin, Burgasser, Adam, Burtin, Etienne, Cano-Díaz, Mariana, Capasso, Raffaella, Cappellari, Michele, Carrera, Ricardo, Chabanier, Solène, Chaplin, William, Chapman, Michael, Cherinka, Brian, Chiappini, Cristina, Choi, Peter Doohyun, Chojnowski, S Drew, Chung, Haeun, Clerc, Nicolas, Coffey, Damien, Comerford, Julia M, Comparat, Johan, da Costa, Luiz, Cousinou, Marie-Claude, Covey, Kevin, Crane, Jeffrey D, Cunha, Katia, da Silva Ilha, Gabriele, Dai, Yu Sophia, Damsted, Sanna B, Darling, Jeremy, Davidson, James W, Davies, Roger, Dawson, Kyle, De, Nikhil, de la Macorra, Axel, De Lee, Nathan, de Andrade Queiroz, Anna Bárbara, Machado, Alice Deconto, de la Torre, Sylvain, Dell’Agli, Flavia, du Mas des Bourboux, Hélion, Diamond-Stanic, Aleksandar M, Dillon, Sean, Donor, John, Drory, Niv, Duckworth, Chris, Dwelly, Tom, Ebelke, Garrett, Eftekharzadeh, Sarah, Eigenbrot, Arthur Davis, Elsworth, Yvonne P, Eracleous, Mike, Erfanianfar, Ghazaleh, Escoffier, Stephanie, Fan, Xiaohui, Farr, Emily, Fernández-Trincado, José G, Feuillet, Diane, Finoguenov, Alexis, Fofie, Patricia, Fraser-McKelvie, Amelia, Frinchaboy, Peter M, Fromenteau, Sebastien, Fu, Hai, and Galbany, Lluís

Subjects
Nuclear and Plasma Physics, Physical Sciences, astro-ph.GA, astro-ph.CO, astro-ph.IM, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

This paper documents the 16th data release (DR16) from the Sloan Digital Sky Surveys (SDSS), the fourth and penultimate from the fourth phase (SDSS-IV). This is the first release of data from the Southern Hemisphere survey of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new data from APOGEE-2 North are also included. DR16 is also notable as the final data release for the main cosmological program of the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and all raw and reduced spectra from that project are released here. DR16 also includes all the data from the Time Domain Spectroscopic Survey and new data from the SPectroscopic IDentification of ERosita Survey programs, both of which were co-observed on eBOSS plates. DR16 has no new data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey (or the MaNGA Stellar Library "MaStar"). We also preview future SDSS-V operations (due to start in 2020), and summarize plans for the final SDSS-IV data release (DR17).

Published
2020

5. The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment

Author

Abolfathi, Bela, Aguado, DS, Aguilar, Gabriela, Prieto, Carlos Allende, Almeida, Andres, Ananna, Tonima Tasnim, Anders, Friedrich, Anderson, Scott F, Andrews, Brett H, Anguiano, Borja, Aragón-Salamanca, Alfonso, Argudo-Fernández, Maria, Armengaud, Eric, Ata, Metin, Aubourg, Eric, Avila-Reese, Vladimir, Badenes, Carles, Bailey, Stephen, Balland, Christophe, Barger, Kathleen A, Barrera-Ballesteros, Jorge, Bartosz, Curtis, Bastien, Fabienne, Bates, Dominic, Baumgarten, Falk, Bautista, Julian, Beaton, Rachael, Beers, Timothy C, Belfiore, Francesco, Bender, Chad F, Bernardi, Mariangela, Bershady, Matthew A, Beutler, Florian, Bird, Jonathan C, Bizyaev, Dmitry, Blanc, Guillermo A, Blanton, Michael R, Blomqvist, Michael, Bolton, Adam S, Boquien, Médéric, Borissova, Jura, Bovy, Jo, Diaz, Christian Andres Bradna, Brandt, William Nielsen, Brinkmann, Jonathan, Brownstein, Joel R, Bundy, Kevin, Burgasser, Adam J, Burtin, Etienne, Busca, Nicolás G, Cañas, Caleb I, Cano-Díaz, Mariana, Cappellari, Michele, Carrera, Ricardo, Casey, Andrew R, Sodi, Bernardo Cervantes, Chen, Yanping, Cherinka, Brian, Chiappini, Cristina, Choi, Peter Doohyun, Chojnowski, Drew, Chuang, Chia-Hsun, Chung, Haeun, Clerc, Nicolas, Cohen, Roger E, Comerford, Julia M, Comparat, Johan, do Nascimento, Janaina Correa, da Costa, Luiz, Cousinou, Marie-Claude, Covey, Kevin, Crane, Jeffrey D, Cruz-Gonzalez, Irene, Cunha, Katia, da Silva Ilha, Gabriele, Damke, Guillermo J, Darling, Jeremy, Davidson, James W, Dawson, Kyle, de Icaza Lizaola, Miguel Angel C, de la Macorra, Axel, de la Torre, Sylvain, De Lee, Nathan, de Sainte Agathe, Victoria, Machado, Alice Deconto, Dell’Agli, Flavia, Delubac, Timothée, Diamond-Stanic, Aleksandar M, Donor, John, Downes, Juan José, Drory, Niv, du Mas des Bourboux, Hélion, Duckworth, Christopher J, Dwelly, Tom, Dyer, Jamie, Ebelke, Garrett, Eigenbrot, Arthur Davis, Eisenstein, Daniel J, Elsworth, Yvonne P, and Emsellem, Eric

Subjects
Astronomical Sciences, Physical Sciences, atlases, catalogs, surveys, astro-ph.GA, astro-ph.IM, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes the second data release from this phase, and the 14th from SDSS overall (making this Data Release Fourteen or DR14). This release makes the data taken by SDSS-IV in its first two years of operation (2014-2016 July) public. Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey; the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data-driven machine-learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from the SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS web site (www.sdss.org) has been updated for this release and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020 and will be followed by SDSS-V.

Published
2018

6. The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

Author

Albareti, Franco D, Prieto, Carlos Allende, Almeida, Andres, Anders, Friedrich, Anderson, Scott, Andrews, Brett H, Aragón-Salamanca, Alfonso, Argudo-Fernández, Maria, Armengaud, Eric, Aubourg, Eric, Avila-Reese, Vladimir, Badenes, Carles, Bailey, Stephen, Barbuy, Beatriz, Barger, Kat, Barrera-Ballesteros, Jorge, Bartosz, Curtis, Basu, Sarbani, Bates, Dominic, Battaglia, Giuseppina, Baumgarten, Falk, Baur, Julien, Bautista, Julian, Beers, Timothy C, Belfiore, Francesco, Bershady, Matthew, de Lis, Sara Bertran, Bird, Jonathan C, Bizyaev, Dmitry, Blanc, Guillermo A, Blanton, Michael, Blomqvist, Michael, Bolton, Adam S, Borissova, J, Bovy, Jo, Brandt, William Nielsen, Brinkmann, Jonathan, Brownstein, Joel R, Bundy, Kevin, Burtin, Etienne, Busca, Nicolás G, Chavez, Hugo Orlando Camacho, Díaz, M Cano, Cappellari, Michele, Carrera, Ricardo, Chen, Yanping, Cherinka, Brian, Cheung, Edmond, Chiappini, Cristina, Chojnowski, Drew, Chuang, Chia-Hsun, Chung, Haeun, Cirolini, Rafael Fernando, Clerc, Nicolas, Cohen, Roger E, Comerford, Julia M, Comparat, Johan, do Nascimento, Janaina Correa, Cousinou, Marie-Claude, Covey, Kevin, Crane, Jeffrey D, Croft, Rupert, Cunha, Katia, Darling, Jeremy, Davidson, James W, Dawson, Kyle, Da Costa, Luiz, Da Silva Ilha, Gabriele, Machado, Alice Deconto, Delubac, Timothée, De Lee, Nathan, De la Macorra, Axel, De la Torre, Sylvain, Diamond-Stanic, Aleksandar M, Donor, John, Downes, Juan Jose, Drory, Niv, Du, Cheng, Du Mas des Bourboux, Hélion, Dwelly, Tom, Ebelke, Garrett, Eigenbrot, Arthur, Eisenstein, Daniel J, Elsworth, Yvonne P, Emsellem, Eric, Eracleous, Michael, Escoffier, Stephanie, Evans, Michael L, Falcón-Barroso, Jesús, Fan, Xiaohui, Favole, Ginevra, Fernandez-Alvar, Emma, Fernandez-Trincado, JG, Feuillet, Diane, Fleming, Scott W, Font-Ribera, Andreu, Freischlad, Gordon, Frinchaboy, Peter, Fu, Hai, and Gao, Yang

Subjects
Astronomical Sciences, Physical Sciences, atlases, catalogs, surveys, astro-ph.GA, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). As well as its core program, eBOSS contains two major subprograms: the Time Domain Spectroscopic Survey (TDSS) and the SPectroscopic IDentification of ERosita Sources (SPIDERS). This paper describes the first data release from SDSS-IV, Data Release 13 (DR13). DR13 makes publicly available the first 1390 spatially resolved integral field unit observations of nearby galaxies from MaNGA. It includes new observations from eBOSS, completing the Sloan Extended QUasar, Emission-line galaxy, Luminous red galaxy Survey (SEQUELS), which also targeted variability-selected objects and X-ray-selected objects. DR13 includes new reductions of the SDSS-III BOSS data, improving the spectrophotometric calibration and redshift classification, and new reductions of the SDSS-III APOGEE-1 data, improving stellar parameters for dwarf stars and cooler stars. DR13 provides more robust and precise photometric calibrations. Value-added target catalogs relevant for eBOSS, TDSS, and SPIDERS and an updated red-clump catalog for APOGEE are also available. This paper describes the location and format of the data and provides references to important technical papers. The SDSS web site, http://www.sdss.org, provides links to the data, tutorials, examples of data access, and extensive documentation of the reduction and analysis procedures. DR13 is the first of a scheduled set that will contain new data and analyses from the planned ∼6 yr operations of SDSS-IV.

Published
2017

7. Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

Author

Blanton, Michael R, Bershady, Matthew A, Abolfathi, Bela, Albareti, Franco D, Prieto, Carlos Allende, Almeida, Andres, Alonso-García, Javier, Anders, Friedrich, Anderson, Scott F, Andrews, Brett, Aquino-Ortíz, Erik, Aragón-Salamanca, Alfonso, Argudo-Fernández, Maria, Armengaud, Eric, Aubourg, Eric, Avila-Reese, Vladimir, Badenes, Carles, Bailey, Stephen, Barger, Kathleen A, Barrera-Ballesteros, Jorge, Bartosz, Curtis, Bates, Dominic, Baumgarten, Falk, Bautista, Julian, Beaton, Rachael, Beers, Timothy C, Belfiore, Francesco, Bender, Chad F, Berlind, Andreas A, Bernardi, Mariangela, Beutler, Florian, Bird, Jonathan C, Bizyaev, Dmitry, Blanc, Guillermo A, Blomqvist, Michael, Bolton, Adam S, Boquien, Médéric, Borissova, Jura, van den Bosch, Remco, Bovy, Jo, Brandt, William N, Brinkmann, Jonathan, Brownstein, Joel R, Bundy, Kevin, Burgasser, Adam J, Burtin, Etienne, Busca, Nicolás G, Cappellari, Michele, Carigi, Maria Leticia Delgado, Carlberg, Joleen K, Rosell, Aurelio Carnero, Carrera, Ricardo, Chanover, Nancy J, Cherinka, Brian, Cheung, Edmond, Chew, Yilen Gómez Maqueo, Chiappini, Cristina, Choi, Peter Doohyun, Chojnowski, Drew, Chuang, Chia-Hsun, Chung, Haeun, Cirolini, Rafael Fernando, Clerc, Nicolas, Cohen, Roger E, Comparat, Johan, da Costa, Luiz, Cousinou, Marie-Claude, Covey, Kevin, Crane, Jeffrey D, Croft, Rupert AC, Cruz-Gonzalez, Irene, Cuadra, Daniel Garrido, Cunha, Katia, Damke, Guillermo J, Darling, Jeremy, Davies, Roger, Dawson, Kyle, de la Macorra, Axel, Dell’Agli, Flavia, De Lee, Nathan, Delubac, Timothée, Di Mille, Francesco, Diamond-Stanic, Aleks, Cano-Díaz, Mariana, Donor, John, Downes, Juan José, Drory, Niv, du Mas des Bourboux, Hélion, Duckworth, Christopher J, Dwelly, Tom, Dyer, Jamie, Ebelke, Garrett, Eigenbrot, Arthur D, Eisenstein, Daniel J, Emsellem, Eric, Eracleous, Mike, Escoffier, Stephanie, Evans, Michael L, Fan, Xiaohui, and Fernández-Alvar, Emma

Subjects
Space Sciences, Astronomical Sciences, Physical Sciences, cosmology: observations, galaxies: general, Galaxy: general, instrumentation: spectrographs, stars: general, surveys, astro-ph.GA, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics
Abstract

We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratios in the near-infrared. The Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey is obtaining spatially resolved spectroscopy for thousands of nearby galaxies (median z ∼ 0.03). The extended Baryon Oscillation Spectroscopic Survey (eBOSS) is mapping the galaxy, quasar, and neutral gas distributions between z ~ 0.6 and 3.5 to constrain cosmology using baryon acoustic oscillations, redshift space distortions, and the shape of the power spectrum. Within eBOSS, we are conducting two major subprograms: the SPectroscopic IDentification of eROSITA Sources (SPIDERS), investigating X-ray AGNs and galaxies in X-ray clusters, and the Time Domain Spectroscopic Survey (TDSS), obtaining spectra of variable sources. All programs use the 2.5 m Sloan Foundation Telescope at the Apache Point Observatory; observations there began in Summer 2014. APOGEE-2 also operates a second near-infrared spectrograph at the 2.5 m du Pont Telescope at Las Campanas Observatory, with observations beginning in early 2017. Observations at both facilities are scheduled to continue through 2020. In keeping with previous SDSS policy, SDSS-IV provides regularly scheduled public data releases; the first one, Data Release 13, was made available in 2016 July.

Published
2017

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