TESS hunt for young and maturing exoplanets (THYME). IV. Three small planets orbiting a 120 Myr old star in the pisces-eridanus stream

Elisabeth R. Newton, Andrew W. Mann, Adam L. Kraus, John H. Livingston, Andrew Vanderburg, Jason L. Curtis, Pa Chia Thao, Keith Hawkins, MacKenna L. Wood, Aaron C. Rizzuto, Abderahmane Soubkiou, Benjamin M. Tofflemire, George Zhou, Ian J.M. Crossfield, Logan A. Pearce, Karen A. Collins, Dennis M. Conti, Thiam Guan Tan, Steven Villeneuva, Alton SpencerDiana Dragomir, Samuel N. Quinn, Eric L.N. Jensen, Kevin I. Collins, Chris Stockdale, Ryan Cloutier, Coel Hellier, Zouhair Benkhaldoun, Carl Ziegler, César Briceño, Nicholas Law, Björn Benneke, Jessie L. Christiansen, Varoujan Gorjian, Stephen R. Kane, Laura Kreidberg, Farisa Y. Morales, Michael W. Werner, Joseph D. Twicken, Alan M. Levine, David R. Ciardi, Natalia M. Guerrero, Katharine Hesse, Elisa V. Quintana, Bernie Shiao, Jeffrey C. Smith, Guillermo Torres, George R. Ricker, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, David W. Latham

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). TOI 451 is a member of the 120 Myr old Pisces-Eridanus stream (Psc-Eri). We confirm membership in the stream with its kinematics, its lithium abundance, and the rotation and UV excesses of both TOI 451 and its wide-binary companion, TOI 451 B (itself likely anM-dwarf binary).We identified three candidate planets transiting in the Transiting Exoplanet Survey Satellite data and followed up the signals with photometry from Spitzer and ground-based telescopes. The system comprises three validated planets at periods of 1.9, 9.2, and 16 days, with radii of 1.9, 3.1, and 4.1 R⊗, respectively. The host star is near-solar mass with V=11.0 and H = 9.3 and displays an infrared excess indicative of a debris disk. The planets offer excellent prospects for transmission spectroscopy with the Hubble Space Telescope and the James Webb Space Telescope, providing the opportunity to study planetary atmospheres that may still be in the process of evolving.

Original languageEnglish (US)
Article numberabccc6
JournalAstronomical Journal
Issue number2
StatePublished - Feb 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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