1. The EXPRES Stellar Signals Project II. State of the field in disentangling photospheric velocities
- Author
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Lily L. Zhao, Debra A. Fischer, Eric B. Ford, Alex Wise, Michaël Cretignier, Suzanne Aigrain, Oscar Barragan, Megan Bedell, Lars A. Buchhave, João D. Camacho, Heather M. Cegla, Jessi Cisewski-Kehe, Andrew Collier Cameron, Zoe L. de Beurs, Sally Dodson-Robinson, Xavier Dumusque, João P. Faria, Christian Gilbertson, Charlotte Haley, Justin Harrell, David W. Hogg, Parker Holzer, Ancy Anna John, Baptiste Klein, Marina Lafarga, Florian Lienhard, Vinesh Maguire-Rajpaul, Annelies Mortier, Belinda Nicholson, Michael L. Palumbo, Victor Ramirez Delgado, Christopher J. Shallue, Andrew Vanderburg, Pedro T. P. Viana, Jinglin Zhao, Norbert Zicher, Samuel H. C. Cabot, Gregory W. Henry, Rachael M. Roettenbacher, John M. Brewer, Joe Llama, Ryan R. Petersburg, Andrew E. Szymkowiak, Apollo-University Of Cambridge Repository, Zhao, LL [0000-0002-3852-3590], Fischer, DA [0000-0003-2221-0861], Ford, EB [0000-0001-6545-639X], Wise, A [0000-0002-5013-5769], Cretignier, M [0000-0002-2207-0750], Aigrain, S [0000-0003-1453-0574], Barragan, O [0000-0003-0563-0493], Bedell, M [0000-0001-9907-7742], Buchhave, LA [0000-0003-1605-5666], Camacho, JD [0000-0001-5121-5560], Cegla, HM [0000-0001-8934-7315], Cisewski-Kehe, J [0000-0002-9656-2272], Collier Cameron, A [0000-0002-8863-7828], De Beurs, ZL [0000-0002-7564-6047], Dodson-Robinson, S [0000-0002-8796-4974], Dumusque, X [0000-0002-9332-2011], Faria, JP [0000-0002-6728-244X], Gilbertson, C [0000-0002-1743-3684], Haley, C [0000-0003-3996-773X], Harrell, J [0000-0001-8936-6276], Hogg, DW [0000-0003-2866-9403], Holzer, P [0000-0001-8936-6276], John, AA [0000-0002-1715-6939], Klein, B [0000-0003-0637-5236], Lafarga, M [0000-0002-8815-9416], Lienhard, F [0000-0003-4047-0771], Maguire-Rajpaul, V [0000-0001-7576-6703], Mortier, A [0000-0001-7254-4363], Nicholson, B [0000-0003-1360-4404], Palumbo, ML [0000-0002-4677-8796], Ramirez Delgado, V [0000-0001-8183-459X], Shallue, CJ [0000-0002-7585-9974], Vanderburg, A [0000-0001-7246-5438], Viana, PTP [0000-0003-1572-8531], Zhao, J [0000-0001-5290-2952], Zicher, N [0000-0001-6143-2905], Cabot, SHC [0000-0001-9749-6150], Henry, GW [0000-0003-4155-8513], Roettenbacher, RM [0000-0002-9288-3482], Brewer, JM [0000-0002-9873-1471], Llama, J [0000-0003-4450-0368], Petersburg, RR [0000-0003-2168-0191], Szymkowiak, AE [0000-0002-4974-687X], Apollo - University of Cambridge Repository, Zhao, Lily L. [0000-0002-3852-3590], Fischer, Debra A. [0000-0003-2221-0861], Ford, Eric B. [0000-0001-6545-639X], Wise, Alex [0000-0002-5013-5769], Cretignier, Michaël [0000-0002-2207-0750], Aigrain, Suzanne [0000-0003-1453-0574], Barragan, Oscar [0000-0003-0563-0493], Bedell, Megan [0000-0001-9907-7742], Buchhave, Lars A. [0000-0003-1605-5666], Camacho, João D. [0000-0001-5121-5560], Cegla, Heather M. [0000-0001-8934-7315], Cisewski-Kehe, Jessi [0000-0002-9656-2272], Collier Cameron, Andrew [0000-0002-8863-7828], de Beurs, Zoe L. [0000-0002-7564-6047], Dodson-Robinson, Sally [0000-0002-8796-4974], Dumusque, Xavier [0000-0002-9332-2011], Faria, João P. [0000-0002-6728-244X], Gilbertson, Christian [0000-0002-1743-3684], Haley, Charlotte [0000-0003-3996-773X], Harrell, Justin [0000-0001-8936-6276], Hogg, David W. [0000-0003-2866-9403], Holzer, Parker [0000-0001-8936-6276], John, Ancy Anna [0000-0002-1715-6939], Klein, Baptiste [0000-0003-0637-5236], Lafarga, Marina [0000-0002-8815-9416], Lienhard, Florian [0000-0003-4047-0771], Maguire-Rajpaul, Vinesh [0000-0001-7576-6703], Mortier, Annelies [0000-0001-7254-4363], Nicholson, Belinda [0000-0003-1360-4404], Palumbo, Michael L., III [0000-0002-4677-8796], Ramirez Delgado, Victor [0000-0001-8183-459X], Shallue, Christopher J. [0000-0002-7585-9974], Vanderburg, Andrew [0000-0001-7246-5438], Viana, Pedro T. P. [0000-0003-1572-8531], Zhao, Jinglin [0000-0001-5290-2952], Zicher, Norbert [0000-0001-6143-2905], Cabot, Samuel H. C. [0000-0001-9749-6150], Henry, Gregory W. [0000-0003-4155-8513], Roettenbacher, Rachael M. [0000-0002-9288-3482], Brewer, John M. [0000-0002-9873-1471], Llama, Joe [0000-0003-4450-0368], Petersburg, Ryan R. [0000-0003-2168-0191], Szymkowiak, Andrew E. [0000-0002-4974-687X], Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. St Andrews Centre for Exoplanet Science
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Radial velocity ,astro-ph.SR ,FOS: Physical sciences ,QB Astronomy ,Exoplanet detection methods ,Astrophysics::Solar and Stellar Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Solar and Stellar Astrophysics (astro-ph.SR) ,QC ,Stellar activity ,QB ,Earth and Planetary Astrophysics (astro-ph.EP) ,MCC ,Spectrometers ,The Solar System, Exoplanets, and Astrobiology ,Astronomy and Astrophysics ,3rd-DAS ,QC Physics ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,astro-ph.EP ,Planet hosting stars ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics ,astro-ph.IM ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Measured spectral shifts due to intrinsic stellar variability (e.g., pulsations, granulation) and activity (e.g., spots, plages) are the largest source of error for extreme precision radial velocity (EPRV) exoplanet detection. Several methods are designed to disentangle stellar signals from true center-of-mass shifts due to planets. The EXPRES Stellar Signals Project (ESSP) presents a self-consistent comparison of 22 different methods tested on the same extreme-precision spectroscopic data from EXPRES. Methods derived new activity indicators, constructed models for mapping an indicator to the needed RV correction, or separated out shape- and shift-driven RV components. Since no ground truth is known when using real data, relative method performance is assessed using the total and nightly scatter of returned RVs and agreement between the results of different methods. Nearly all submitted methods return a lower RV RMS than classic linear decorrelation, but no method is yet consistently reducing the RV RMS to sub-meter-per-second levels. There is a concerning lack of agreement between the RVs returned by different methods. These results suggest that continued progress in this field necessitates increased interpretability of methods, high-cadence data to capture stellar signals at all timescales, and continued tests like the ESSP using consistent data sets with more advanced metrics for method performance. Future comparisons should make use of various well-characterized data sets -- such as solar data or data with known injected planetary and/or stellar signals -- to better understand method performance and whether planetary signals are preserved., 33 pages (+12 pages of Appendix), 10 figures, 8 tables, accepted for publication in AJ
- Published
- 2022