Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit

被引：34

作者：

Grieves, Nolan ^{[1
]}

Bouchy, Francois ^{[1
]}

Lendl, Monika ^{[1
]}

Carmichael, Theron ^{[2
,3
]}

Mireles, Ismael ^{[4
]}

Shporer, Avi ^{[5
,6
]}

McLeod, Kim K. ^{[7
]}

Collins, Karen A. ^{[3
]}

Brahm, Rafael ^{[8
,9
]}

Stassun, Keivan G. ^{[10
]}

Gill, Sam ^{[11
,12
]}

Bouma, Luke G. ^{[13
]}

Guillot, Tristan ^{[14
]}

Cointepas, Marion ^{[1
,15
]}

Dos Santos, Leonardo A. ^{[1
]}

Casewell, Sarah L. ^{[16
]}

Jenkins, Jon M. ^{[17
]}

Henning, Thomas ^{[18
]}

Nielsen, Louise D. ^{[1
]}

Psaridi, Angelica ^{[1
]}

Udry, Stephane ^{[1
]}

Segransan, Damien ^{[1
]}

Eastman, Jason D. ^{[3
]}

Zhou, George ^{[3
]}

Abe, Lyu ^{[14
]}

Agabi, Abelkrim ^{[14
]}

Bakos, Gaspar ^{[13
,19
,20
]}

Charbonneau, David ^{[3
]}

Collins, Kevin, I ^{[19
,20
]}

Colon, Knicole D. ^{[21
]}

Crouzet, Nicolas ^{[22
]}

Dransfield, Georgina ^{[23
]}

Evans, Phil ^{[24
]}

Goeke, Robert F. ^{[5
,6
]}

Hart, Rhodes ^{[25
]}

Irwin, Jonathan M. ^{[3
]}

Jensen, Eric L. N. ^{[26
]}

Jordan, Andres ^{[8
,9
]}

Kielkopf, John F. ^{[27
]}

Latham, David W. ^{[3
]}

Marie-Sainte, Wenceslas ^{[28
]}

Mekarnia, Djamel ^{[14
]}

Nelson, Peter ^{[29
]}

Quinn, Samuel N. ^{[3
]}

Radford, Don J. ^{[30
]}

Rodriguez, David R. ^{[31
]}

Rowden, Pamela ^{[32
]}

Schmider, Francois-Xavier ^{[14
]}

Schwarz, Richard P. ^{[33
]}

Smith, Jeffrey C. ^{[17
,34
]}

机构：

[1] Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Sauverny, Switzerland

[2] Harvard Univ, Cambridge, MA 02138 USA

[3] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[4] Univ New Mexico, Dept Phys & Astron, 210 Yale Blvd NE, Albuquerque, NM 87106 USA

[5] MIT, Dept Phys, Cambridge, MA 02139 USA

[6] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[7] Wellesley Coll, Dept Astron, Wellesley, MA 02481 USA

[8] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Torres 2640, Santiago, Chile

[9] Millennium Inst Astrophys, Santiago, Chile

[10] Vanderbilt Univ, Dept Phys & Astron, 6301 Stevenson Ctr Lane, Nashville, TN 37235 USA

[11] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[12] Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[13] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08540 USA

[14] Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS, CS 34229, F-06304 Nice 4, France

[15] Univ Grenoble Alpes, IPAG, CNRS, F-38000 Grenoble, France

[16] Univ Leicester, Sch Phys & Astron, Leicester LE1 7RH, Leics, England

[17] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[18] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[19] Inst Adv Study, Princeton, NJ 08540 USA

[20] George Mason Univ, 4400 Univ Dr, Fairfax, VA 22030 USA

[21] NASA, Goddard Space Flight Ctr, Exoplanets & Stellar Astro Phys Lab, Code 667, Greenbelt, MD 20771 USA

[22] European Space Res & Technol Ctr ESTEC, European Space Agcy ESA, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[23] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[24] Sauce Observ, Coquimbo, Coquimbo Provin, Chile

[25] Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia

[26] Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA

[27] Univ Louisville, Dept Phys & Astron, Louisville, KY 40292 USA

[28] IPEV PNRA, Concordia Stn, Santiago, Chile

[29] Ellinbank Observ, Victoria, Australia

[30] Brierfield Observ, Port Macquarie, NSW, Australia

[31] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[32] Royal Astron Soc, Burlington House, London W1J 0BQ, England

[33] Patashnick Voorheesville Observ, Voorheesville, NY 12186 USA

[34] SETI Inst, Mountain View, CA 94043 USA

[35] Hazelwood Observ, Churchill, Australia

[36] Perth Exoplanet Survey Telescope, Perth, WA, Australia

[37] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA

[38] Mt Stuart Observ, Glenore, New Zealand

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 652卷

基金：

瑞士国家科学基金会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

brown dwarfs; stars; low-mass; binaries: eclipsing; ECLIPSING BINARY; TIDAL EVOLUTION; SOPHIE VELOCIMETRY; MAGNETIC BRAKING; ERROR-CORRECTION; ACCURATE MASS; GIANT PLANETS; HOT JUPITERS; B; KEPLER;

D O I：

10.1051/0004-6361/202141145

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of five transiting companions near the hydrogen-burning mass limit in close orbits around main sequence stars originally identified by the Transiting Exoplanet Survey Satellite (TESS) as TESS objects of interest (TOIs): TOI-148, TOI-587, TOI-681, TOI-746, and TOI-1213. Using TESS and ground-based photometry as well as radial velocities from the CORALIE, CHIRON, TRES, and FEROS spectrographs, we found the companions have orbital periods between 4.8 and 27.2 days, masses between 77 and 98 M-Jup , and radii between 0.81 and 1.66 R-Jup . These targets have masses near the uncertain lower limit of hydrogen core fusion (similar to 73-96 M-Jup ), which separates brown dwarfs and low-mass stars. We constrained young ages for TOI-587 (0.2 +/- 0.1 Gyr) and TOI-681 (0.17 +/- 0.03 Gyr) and found them to have relatively larger radii compared to other transiting companions of a similar mass. Conversely we estimated older ages for TOI-148 and TOI-746 and found them to have relatively smaller companion radii. With an effective temperature of 9800 +/- 200 K, TOI-587 is the hottest known main-sequence star to host a transiting brown dwarf or very low-mass star. We found evidence of spin-orbit synchronization for TOI-148 and TOI-746 as well as tidal circularization for TOI-148. These companions add to the population of brown dwarfs and very low-mass stars with well measured parameters ideal to test formation models of these rare objects, the origin of the brown dwarf desert, and the distinction between brown dwarfs and hydrogen-burning main sequence stars.

引用

页数：25

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