Orbital and Atmospheric Characterization of the 1RXS J034231.8+121622 System using High-resolution Spectroscopy Confirms that the Companion is a Low-mass Star

被引：0

作者：

Do O, Clarissa R. ^{[1
]}

Sappey, Ben ^{[1
]}

Konopacky, Quinn M. ^{[2
]}

Ruffio, Jean-Baptiste ^{[2
]}

O'Neil, Kelly K. ^{[3
]}

Do, Tuan ^{[4
]}

Martinez, Gregory ^{[4
]}

Barman, Travis S. ^{[5
]}

Nguyen, Jayke S. ^{[2
]}

Xuan, Jerry W. ^{[6
]}

Theissen, Christopher A. ^{[2
]}

Blunt, Sarah ^{[7
,8
]}

Thompson, William ^{[9
]}

Hsu, Chih-Chun ^{[7
,8
]}

Baker, Ashley ^{[6
]}

Bartos, Randall ^{[10
]}

Blake, Geoffrey A. ^{[11
]}

Calvin, Benjamin ^{[4
,6
]}

Cetre, Sylvain ^{[12
]}

Delorme, Jacques-Robert ^{[12
]}

Doppmann, Greg ^{[12
]}

Echeverri, Daniel ^{[6
]}

Finnerty, Luke ^{[4
]}

Fitzgerald, Michael P. ^{[4
]}

Inglis, Julie ^{[11
]}

Jovanovic, Nemanja ^{[6
]}

Lopez, Ronald A. ^{[4
]}

Mawet, Dimitri ^{[6
,10
]}

Morris, Evan ^{[13
]}

Pezzato, Jacklyn ^{[6
]}

Schofield, Tobias ^{[6
]}

Skemer, Andrew ^{[13
]}

Wallace, J. Kent ^{[10
]}

Wang, Jason J. ^{[7
,8
]}

Wang, Ji ^{[14
]}

Liberman, Joshua ^{[15
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Dept Astron & Astrophys, La Jolla, CA 92093 USA

[3] Univ Nevada, Dept Phys, Reno, NV 89557 USA

[4] Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 USA

[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[6] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[7] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA

[8] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[9] Natl Res Council Canada Herzberg, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

[10] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[11] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[12] WM Keck Observ, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743 USA

[13] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[14] Ohio State Univ, Dept Astron, 100 W 18th Ave, Columbus, OH 43210 USA

[15] Univ Arizona, James C Wyant Coll Opt Sci, Meinel Bldg,1630 E Univ Blvd, Tucson, AZ 85721 USA

来源：

ASTRONOMICAL JOURNAL | 2024年 / 167卷 / 06期

基金：

美国国家科学基金会;

关键词：

RADIAL-VELOCITY MEASUREMENTS; K-BAND SPECTROSCOPY; PRE-MAIN-SEQUENCE; COOL BROWN DWARFS; HR; 8799; PLANETS; ROTATIONAL VELOCITIES; EVOLUTIONARY MODELS; T DWARFS; ECCENTRICITY DISTRIBUTION; EFFICIENT;

D O I：

10.3847/1538-3881/ad3df3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 circle dot and 0.08 +/- 0.01 M circle dot (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.

引用

页数：24

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