TY - JOUR
T1 - Orbital and Atmospheric Characterization of the 1RXS J034231.8+121622 System using High-resolution Spectroscopy Confirms that the Companion is a Low-mass Star
AU - Do Ó, Clarissa R.
AU - Sappey, Ben
AU - Konopacky, Quinn M.
AU - Ruffio, Jean Baptiste
AU - O’Neil, Kelly K.
AU - Do, Tuan
AU - Martinez, Gregory
AU - Barman, Travis S.
AU - Nguyen, Jayke S.
AU - Xuan, Jerry W.
AU - Theissen, Christopher A.
AU - Blunt, Sarah
AU - Thompson, William
AU - Hsu, Chih Chun
AU - Baker, Ashley
AU - Bartos, Randall
AU - Blake, Geoffrey A.
AU - Calvin, Benjamin
AU - Cetre, Sylvain
AU - Delorme, Jacques Robert
AU - Doppmann, Greg
AU - Echeverri, Daniel
AU - Finnerty, Luke
AU - Fitzgerald, Michael P.
AU - Inglis, Julie
AU - Jovanovic, Nemanja
AU - López, Ronald A.
AU - Mawet, Dimitri
AU - Morris, Evan
AU - Pezzato, Jacklyn
AU - Schofield, Tobias
AU - Skemer, Andrew
AU - Wallace, J. Kent
AU - Wang, Jason J.
AU - Wang, Ji
AU - Liberman, Joshua
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/6/1
Y1 - 2024/6/1
N2 - The 1RXS J034231.8+121622 system consists of an M dwarf primary and a directly imaged low-mass stellar companion. We use high-resolution spectroscopic data from Keck/KPIC to estimate the objects' atmospheric parameters and radial velocities (RVs). Using PHOENIX stellar models, we find that the primary has a temperature of 3460 ± 50 K and a metallicity of 0.16 ± 0.04, while the secondary has a temperature of 2510 ± 50 K and a metallicity of 0.13 − 0.11 + 0.12 . Recent work suggests this system is associated with the Hyades, giving it an older age than previous estimates. Both metallicities agree with current Hyades [Fe/H] measurements (0.11-0.21). Using stellar evolutionary models, we obtain significantly higher masses for the objects, 0.30 ± 0.15 M ⊙ and 0.08 ± 0.01 M ⊙ (84 ± 11 M Jup), respectively. Using the RVs and a new astrometry point from Keck/NIRC2, we find that the system is likely an edge-on, moderately eccentric ( 0.41 − 0.08 + 0.27 ) configuration. We also estimate the C/O ratio of both objects using custom grid models, obtaining 0.42 ± 0.10 (primary) and 0.55 ± 0.10 (companion). From these results, we confirm that this system most likely went through a binary star formation process in the Hyades. The significant changes in this system's parameters since its discovery highlight the importance of high-resolution spectroscopy for both orbital and atmospheric characterization of directly imaged companions.
AB - The 1RXS J034231.8+121622 system consists of an M dwarf primary and a directly imaged low-mass stellar companion. We use high-resolution spectroscopic data from Keck/KPIC to estimate the objects' atmospheric parameters and radial velocities (RVs). Using PHOENIX stellar models, we find that the primary has a temperature of 3460 ± 50 K and a metallicity of 0.16 ± 0.04, while the secondary has a temperature of 2510 ± 50 K and a metallicity of 0.13 − 0.11 + 0.12 . Recent work suggests this system is associated with the Hyades, giving it an older age than previous estimates. Both metallicities agree with current Hyades [Fe/H] measurements (0.11-0.21). Using stellar evolutionary models, we obtain significantly higher masses for the objects, 0.30 ± 0.15 M ⊙ and 0.08 ± 0.01 M ⊙ (84 ± 11 M Jup), respectively. Using the RVs and a new astrometry point from Keck/NIRC2, we find that the system is likely an edge-on, moderately eccentric ( 0.41 − 0.08 + 0.27 ) configuration. We also estimate the C/O ratio of both objects using custom grid models, obtaining 0.42 ± 0.10 (primary) and 0.55 ± 0.10 (companion). From these results, we confirm that this system most likely went through a binary star formation process in the Hyades. The significant changes in this system's parameters since its discovery highlight the importance of high-resolution spectroscopy for both orbital and atmospheric characterization of directly imaged companions.
UR - http://www.scopus.com/inward/record.url?scp=85194109272&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85194109272&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/ad3df3
DO - 10.3847/1538-3881/ad3df3
M3 - Article
AN - SCOPUS:85194109272
SN - 0004-6256
VL - 167
JO - Astronomical Journal
JF - Astronomical Journal
IS - 6
M1 - 278
ER -