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

Hedges, Christina and Hughes, Alex and Zhou, George ORCID: https://orcid.org/0000-0002-4891-3517 and David, Trevor J. and Becker, Juliette and Giacalone, Steven and Vanderburg, Andrew and Rodriguez, Joseph E. and Bieryla, Allyson and Wirth, Christopher and Atherton, Shaun and Fetherolf, Tara and Collins, Karen A. and Price-Whelan, Adrian M. and Bedell, Megan and Quinn, Samuel N. and Gan, Tianjun and Ricker, George R. and Latham, David W. and Vanderspek, Roland K. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Kielkopf, John F. and Schwarz, Richard P. and Dressing, Courtney D. and Gonzales, Erica J. and Crossfield, Ian J. M. and Matthews, Elisabeth C. and Jensen, Eric L. N. and Furlan, Elise and Gnilka, Crystal L. and Howell, Steve B. and Lester, Kathryn V. and Scott, Nicholas J. and Feliz, Dax L. and Lund, Michael B. and Siverd, Robert J. and Stevens, Daniel J. and Narita, N. and Fukui, A. and Murgas, F. and Palle, Enric and Sutton, Phil J. and Stassun, Keivan G. and Bouma, Luke G. and Vezie, Michael and Villasenor, Jesus Noel and Quintana, Elisa V. and Smith, Jeffrey C. (2021) TOI-2076 and TOI-1807: Two Young, Comoving Planetary Systems within 50 pc Identified by TESS that are Ideal Candidates for Further Follow Up. The Astronomical Journal, 162 (2):54. pp. 1-22. ISSN 0004-6256


Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 07 Mar 2022 03:49
Last Modified: 30 Mar 2022 03:50
Uncontrolled Keywords: Exoplanets; Transits; Time series analysis; Astrophysics - Earth and Planetary Astrophysics; Astrophysics -Instrumentation and Methods for Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Funding Details:
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ac06cd
URI: http://eprints.usq.edu.au/id/eprint/44993

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