TOI-2076 and TOI-1807: Two Young, Comoving Planetary Systems within 50 pc Identified by TESS that are Ideal Candidates for Further Follow up

Christina Hedges*, Alex Hughes, George Zhou, Trevor J. David, Juliette Becker, Steven Giacalone, Andrew Vanderburg, Joseph E. Rodriguez, Allyson Bieryla, Christopher Wirth, Shaun Atherton, Tara Fetherolf, Karen A. Collins, Adrian M. Price-Whelan, Megan Bedell, Samuel N. Quinn, Tianjun Gan, George R. Ricker, David W. Latham, Roland K. VanderspekSara Seager, Joshua N. Winn, Jon M. Jenkins, Lars A. Buchhave, René Rasmussen, John F. Kielkopf, Richard P. Schwarz, Courtney D. Dressing, Erica J. Gonzales, Ian J.M. Crossfield, Elisabeth C. Matthews, Eric L.N. Jensen, Elise Furlan, Crystal L. Gnilka, Steve B. Howell, Kathryn V. Lester, Nicholas J. Scott, Dax L. Feliz, Michael B. Lund, Robert J. Siverd, Daniel J. Stevens, N. Narita, A. Fukui, F. Murgas, Enric Palle, Phil J. Sutton, Keivan G. Stassun, Luke G. Bouma, Michael Vezie, Jesus Noel Villasenor, Elisa V. Quintana, Jeffrey C. Smith

*Corresponding author for this work

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    We report the discovery of two planetary systems around comoving stars: TOI-2076 (TIC 27491137) and TOI-1807 (TIC 180695581). TOI-2076 is a nearby (41.9 pc) multiplanetary system orbiting a young (204 ± 50 Myr), bright (K = 7.115 in TIC v8.1) start. TOI-1807 hosts a single transiting planet and is similarly nearby (42.58 pc), similarly young (180 ± 40 Myr ), and bright. Both targets exhibit significant, periodic variability due to starspots, characteristic of their young ages. Using photometric data collected by TESS we identify three transiting planets around TOI-2076 with radii of R b = 3.3 ± 0.04 R ⊕, R c = 4.4 ± 0.05 R ⊕, and R d = 4.1 ± 0.07 R ⊕. Planet TOI-2076b has a period of P b = 10.356 days. For both TOI-2076c and d, TESS observed only two transits, separated by a 2 yr interval in which no data were collected, preventing a unique period determination. A range of long periods (<17 days) are consistent with the data. We identify a short-period planet around TOI-1807 with a radius of R b = 1.8 ± 0.04 R ⊕ and a period of P b = 0.549 days. Their close proximity, and bright, cool host stars, and young ages make these planets excellent candidates for follow up. TOI-1807b is one of the best-known small (R < 2 R⊕) planets for characterization via eclipse spectroscopy and phase curves with JWST. TOI-1807b is the youngest ultra-short-period planet discovered to date, providing valuable constraints on formation timescales of short-period planets. Given the rarity of young planets, particularly in multiple-planet systems, these planets present an unprecedented opportunity to study and compare exoplanet formation, and young planet atmospheres, at a crucial transition age for formation theory.

    Original languageEnglish
    Article number54
    JournalAstronomical Journal
    Issue number2
    Number of pages22
    Publication statusPublished - 2021

    Bibliographical note

    This article is corrected by 2021 AJ 162 265:
    The erratum updates the author list of this work to include two authors that were omitted from the original publication in error.


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