TESS Hunt for Young and Maturing Exoplanets (THYME). XI. An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group

被引：19

作者：

Capistrant, Benjamin K. ^{[1
]}

Soares-Furtado, Melinda ^{[2
,3
,4
]}

Vanderburg, Andrew ^{[3
,4
]}

Jankowski, Alyssa ^{[2
]}

Mann, Andrew W. ^{[5
]}

Ross, Gabrielle ^{[6
]}

Srdoc, Gregor ^{[7
]}

Hinkel, Natalie R. ^{[8
,9
]}

Becker, Juliette ^{[2
]}

Magliano, Christian ^{[10
]}

Limbach, Mary Anne ^{[11
]}

Stephan, Alexander P. ^{[12
,13
]}

Nine, Andrew C. ^{[2
]}

Tofflemire, Benjamin M. ^{[14
]}

Kraus, Adam L. ^{[14
]}

Giacalone, Steven ^{[15
]}

Winn, Joshua N. ^{[6
]}

Bieryla, Allyson ^{[16
]}

Bouma, Luke G. ^{[17
]}

Ciardi, David R. ^{[18
]}

Collins, Karen A. ^{[16
]}

Covone, Giovanni ^{[10
]}

de Beurs, Zoe L. ^{[19
]}

Huang, Chelsea X. ^{[20
]}

Jenkins, Jon M. ^{[21
]}

Kreidberg, Laura ^{[22
]}

Latham, David W. ^{[16
]}

Quinn, Samuel N. ^{[16
]}

Seager, Sara ^{[3
,4
,19
,23
]}

Shporer, Avi ^{[3
,4
]}

Twicken, Joseph D. ^{[21
,24
]}

Wohler, Bill ^{[21
,24
]}

Vanderspek, Roland K. ^{[3
,4
]}

Yarza, Ricardo ^{[25
,26
]}

Ziegler, Carl ^{[27
]}

机构：

[1] Univ Florida, Dept Astron, Bryant Space Sci Ctr, Stadium Rd, Gainesville, FL 32611 USA

[2] Univ Wisconsin Madison, Dept Astron, 475 N Charter St, Madison, WI 53706 USA

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

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

[5] Univ North Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[6] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[7] Kotizarovci Observ, Sarsoni 90, Viskovo 51216, Croatia

[8] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[9] Southwest Res Inst, San Antonio, TX 78238 USA

[10] Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, I-80126 Naples, Italy

[11] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[12] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[13] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, Columbus, OH 43210 USA

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

[15] Univ Calif Berkeley, Dept Astron, 501 Campbell Hall,3411, Berkeley, CA 94720 USA

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

[17] CALTECH, Dept Astron, MC 249-17, Pasadena, CA 91125 USA

[18] CALTECH, IPAC, NASA, Exoplanet Sci Inst, 770 S Wilson Ave, Pasadena, CA 91106 USA

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

[20] Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia

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

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

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

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

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

[26] Univ Texas Austin, Texas Adv Comp Ctr, Austin, TX 78759 USA

[27] Stephen F Austin State Univ, Dept Phys Engn & Astron, 1936 North St, Nacogdoches, TX 75962 USA

来源：

ASTRONOMICAL JOURNAL | 2024年 / 167卷 / 02期

关键词：

K2 ROTATION PERIODS; PRE-MAIN-SEQUENCE; POWERED MASS-LOSS; RADIUS DISTRIBUTION; LITHIUM ABUNDANCES; TERRESTRIAL PLANETS; ZODIACAL EXOPLANETS; EXTRASOLAR PLANETS; ERROR-CORRECTION; 2-PLANET SYSTEM;

D O I：

10.3847/1538-3881/ad1039

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433 d-a nearby (22 pc), Earth-sized planet transiting a young Sun-like star (TOI-1726, HD 63433). HD 63433 d is the third planet detected in this multiplanet system. The kinematic, rotational, and abundance properties of the host star indicate that it belongs to the young (414 +/- 23 Myr) Ursa Major moving group, whose membership we update using new data from the third data release of the Gaia mission and TESS. Our transit analysis of the TESS light curves indicates that HD 63433 d has a radius of 1.1 R circle plus and closely orbits its host star with a period of 4.2 days. To date, HD 63433 d is the smallest confirmed exoplanet with an age less than 500 Myr, and the nearest young Earth-sized planet. Furthermore, the apparent brightness of the stellar host (V similar or equal to 6.9 mag) makes this transiting multiplanet system favorable to further investigations, including spectroscopic follow-up to probe the atmospheric loss in a young Earth-sized world.

引用

页数：18

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