The Astronomical Journal (Jan 2024)
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
- Benjamin K. Capistrant,
- Melinda Soares-Furtado,
- Andrew Vanderburg,
- Alyssa Jankowski,
- Andrew W. Mann,
- Gabrielle Ross,
- Gregor Srdoc,
- Natalie R. Hinkel,
- Juliette Becker,
- Christian Magliano,
- Mary Anne Limbach,
- Alexander P. Stephan,
- Andrew C. Nine,
- Benjamin M. Tofflemire,
- Adam L. Kraus,
- Steven Giacalone,
- Joshua N. Winn,
- Allyson Bieryla,
- Luke G. Bouma,
- David R. Ciardi,
- Karen A. Collins,
- Giovanni Covone,
- Zoë L. de Beurs,
- Chelsea X. Huang,
- Jon M. Jenkins,
- Laura Kreidberg,
- David W. Latham,
- Samuel N. Quinn,
- Sara Seager,
- Avi Shporer,
- Joseph D. Twicken,
- Bill Wohler,
- Roland K. Vanderspek,
- Ricardo Yarza,
- Carl Ziegler
Affiliations
- Benjamin K. Capistrant
- ORCiD
- Department of Astronomy, University of Florida , Bryant Space Science Center, Stadium Road, Gainesville, FL 32611, USA ; [email protected]
- Melinda Soares-Furtado
- ORCiD
- Department of Astronomy, University of Wisconsin-Madison , 475 N. Charter Street, Madison, WI 53706, USA ; [email protected]; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Andrew Vanderburg
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Alyssa Jankowski
- ORCiD
- Department of Astronomy, University of Wisconsin-Madison , 475 N. Charter Street, Madison, WI 53706, USA ; [email protected]
- Andrew W. Mann
- ORCiD
- Department of Physics & Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599-3255, USA
- Gabrielle Ross
- ORCiD
- Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA
- Gregor Srdoc
- Kotizarovci Observatory , Sarsoni 90, 51216 Viskovo, Croatia
- Natalie R. Hinkel
- ORCiD
- Physics & Astronomy Department, Louisiana State University , Baton Rouge, LA 70803, USA; Southwest Research Institute , San Antonio, TX 78238, USA
- Juliette Becker
- ORCiD
- Department of Astronomy, University of Wisconsin-Madison , 475 N. Charter Street, Madison, WI 53706, USA ; [email protected]
- Christian Magliano
- ORCiD
- Dipartimento di Fisica “Ettore Pancini,” Università di Napoli Federico II , I-80126 Napoli, Italy
- Mary Anne Limbach
- ORCiD
- Department of Astronomy, University of Michigan , Ann Arbor, MI 48109, USA
- Alexander P. Stephan
- ORCiD
- Department of Astronomy, The Ohio State University , Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , Columbus, OH 43210, USA
- Andrew C. Nine
- ORCiD
- Department of Astronomy, University of Wisconsin-Madison , 475 N. Charter Street, Madison, WI 53706, USA ; [email protected]
- Benjamin M. Tofflemire
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Adam L. Kraus
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Steven Giacalone
- ORCiD
- Department of Astronomy, 501 Campbell Hall #3411, University of California , Berkeley, Berkeley, CA 94720, USA
- Joshua N. Winn
- ORCiD
- Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA
- Allyson Bieryla
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Luke G. Bouma
- ORCiD
- Department of Astronomy, MC 249-17, California Institute of Technology , Pasadena, CA 91125, USA
- David R. Ciardi
- ORCiD
- Caltech/IPAC-NASA Exoplanet Science Institute , 770 S. Wilson Avenue, Pasadena, CA 91106, USA
- Karen A. Collins
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Giovanni Covone
- ORCiD
- Dipartimento di Fisica “Ettore Pancini,” Università di Napoli Federico II , I-80126 Napoli, Italy
- Zoë L. de Beurs
- ORCiD
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Chelsea X. Huang
- ORCiD
- University of Southern Queensland , Centre for Astrophysics, West Street, Toowoomba, QLD 4350 Australia
- Jon M. Jenkins
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Laura Kreidberg
- ORCiD
- Max Planck Institute for Astronomy , Königstuhl 17, D-69117 Heidelberg, Germany
- David W. Latham
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Samuel N. Quinn
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Sara Seager
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Avi Shporer
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Joseph D. Twicken
- ORCiD
- SETI Institute , Mountain View, CA 94043 USA/NASA Ames Research Center, Moffett Field, CA 94035 USA
- Bill Wohler
- ORCiD
- SETI Institute , Mountain View, CA 94043 USA/NASA Ames Research Center, Moffett Field, CA 94035 USA
- Roland K. Vanderspek
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Ricardo Yarza
- ORCiD
- Department of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USA; Texas Advanced Computing Center, University of Texas , Austin, TX 78759, USA
- Carl Ziegler
- ORCiD
- Department of Physics, Engineering and Astronomy, Stephen F. Austin State University , 1936 North Street, Nacogdoches, TX 75962, USA
- DOI
- https://doi.org/10.3847/1538-3881/ad1039
- Journal volume & issue
-
Vol. 167,
no. 2
p. 54
Abstract
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 _⊕ 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 ≃ 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.
Keywords
