TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux

被引：57

作者：

Mann, Andrew W. ^{[1
]}

Wood, Mackenna L. ^{[1
]}

Schmidt, Stephen P. ^{[1
]}

Barber, Madyson G. ^{[1
]}

Owen, James E. ^{[2
]}

Tofflemire, Benjamin M. ^{[3
]}

Newton, Elisabeth R. ^{[4
]}

Mamajek, Eric E. ^{[5
,6
]}

Bush, Jonathan L. ^{[1
]}

Mace, Gregory N. ^{[3
]}

Kraus, Adam L. ^{[1
]}

Thao, Pa Chia ^{[7
,8
]}

Vanderburg, Andrew ^{[9
]}

Llama, Joe ^{[10
]}

Johns-Krull, Christopher M. ^{[9
]}

Prato, L. ^{[10
]}

Stahl, Asa G. ^{[9
,11
]}

Tang, Shih-Yun ^{[1
]}

Fields, Matthew J. ^{[12
]}

Collins, Karen A. ^{[13
]}

Collins, Kevin, I ^{[14
,15
]}

Gan, Tianjun ^{[14
,15
]}

Jensen, Eric L. N. ^{[16
]}

Kamler, Jacob ^{[17
]}

Schwarz, Richard P. ^{[18
]}

Furlan, Elise ^{[19
]}

Gnilka, Crystal L. ^{[20
]}

Howell, Steve B. ^{[20
]}

Lester, Kathryn, V ^{[20
]}

Owens, Dylan A. ^{[1
]}

Suarez, Olga ^{[21
]}

Mekarnia, Djamel ^{[21
]}

Guillot, Tristan ^{[21
]}

Abe, Lyu ^{[21
]}

Triaud, Amaury H. M. J. ^{[22
]}

Johnson, Marshall C. ^{[23
]}

Milburn, Reilly P. ^{[1
]}

Rizzuto, Aaron C. ^{[3
]}

Quinn, Samuel N. ^{[12
]}

Kerr, Ronan ^{[3
]}

Ricker, George R. ^{[7
,8
]}

Vanderspek, Roland ^{[7
,8
]}

Latham, David W. ^{[12
]}

Seager, Sara ^{[7
,8
,24
,25
]}

Winn, Joshua N. ^{[26
]}

Jenkins, Jon M. ^{[20
]}

Guerrero, Natalia M. ^{[27
]}

Shporer, Avi ^{[7
,8
]}

Schlieder, Joshua E. ^{[28
]}

McLean, Brian ^{[29
]}

机构：

[1] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[2] Imperial Coll London, Blackett Lab, Astrophys Grp, Prince Consort Rd, London SW7 2AZ, England

[3] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[4] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

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

[6] Univ Rochester, Dept Phys & Astron, 500 Wilson Blvd, Rochester, NY 14627 USA

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

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

[9] Lowell Observ, 1400 West Mars Hill Rd, Flagstaff, AZ 86001 USA

[10] Rice Univ, Dept Phys & Astron, 6100 Main St, Houston, TX 77005 USA

[11] No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USA

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

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

[14] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

[15] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China

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

[17] John F Kennedy High Sch, 3000 Bellmore Ave, Bellmore, NY 11710 USA

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

[19] Caltech, NASA, Exoplanet Sci Inst, IPAC, 1200 E Calif Blvd, Pasadena, CA 91125 USA

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

[21] Univ Cote dAzur, Lab Lagrange, CNRS, Observ Cote dAzur, Bd lObserv,CS 34229, F-06304 Nice 4, France

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

[23] Las Cumbres Observ, 6740 Cortona Dr,Ste 102, Goleta, CA 93117 USA

[24] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[25] MIT, Dept Aeronaut & Astronaut, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[26] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA

[27] Univ Florida, Dept Astron, Gainesville, FL 32811 USA

[28] NASA, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

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

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

来源：

ASTRONOMICAL JOURNAL | 2022年 / 163卷 / 04期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

SPIN-ORBIT ALIGNMENT; MAIN-SEQUENCE STARS; HOT JUPITER; ZODIACAL EXOPLANETS; RADIAL-VELOCITIES; ERROR-CORRECTION; MAGNETIC-FIELD; F-STAR; STELLAR; NEPTUNE;

D O I：

10.3847/1538-3881/ac511d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Mature super-Earths and sub-Neptunes are predicted to be similar or equal to Jovian radius when younger than 10 Myr. Thus, we expect to find 5-15 R (circle plus) planets around young stars even if their older counterparts harbor none. We report the discovery and validation of TOI 1227b, a 0.85 +/- 0.05 R (J) (9.5 R (circle plus)) planet transiting a very-low-mass star (0.170 +/- 0.015 M (circle dot)) every 27.4 days. TOI 1227's kinematics and strong lithium absorption confirm that it is a member of a previously discovered subgroup in the Lower Centaurus Crux OB association, which we designate the Musca group. We derive an age of 11 +/- 2 Myr for Musca, based on lithium, rotation, and the color-magnitude diagram of Musca members. The TESS data and ground-based follow-up show a deep (2.5%) transit. We use multiwavelength transit observations and radial velocities from the IGRINS spectrograph to validate the signal as planetary in nature, and we obtain an upper limit on the planet mass of similar or equal to 0.5 M (J). Because such large planets are exceptionally rare around mature low-mass stars, we suggest that TOI 1227b is still contracting and will eventually turn into one of the more common R (circle plus) planets.

引用

页数：26

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