TOI-2076 and TOI-1807: Two young, comoving planetary systems within 50 pc identified by TESS that are ideal candidates for further follow-up

Kavli Affiliate: Roland K. Vanderspek

| First 5 Authors: Christina Hedges, Alex Hughes, Steven Giacalone, George Zhou, Trevor J. David

| Summary:

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) multi-planetary system orbiting a young (204$pm$50 Myr), bright (K =
7.115 in TIC v8.1). TOI-1807 hosts a single transiting planet, and is similarly
nearby (42.58pc), similarly young (180$pm$40 Myr), and bright. Both targets
exhibit significant, periodic variability due to star spots, characteristic of
their young ages. Using photometric data collected by TESS we identify three
transiting planets around TOI-2076 with radii of R$_b$=3.3$pm$0.04$R_oplus$,
R$_c$=4.4$pm$0.05$R_oplus$, and R$_d$=4.1$pm$0.07$R_oplus$. Planet
TOI-2076b has a period of P$_b$=10.356 d. For both TOI 2076c and d, TESS
observed only two transits, separated by a 2-year interval in which no data
were collected, preventing a unique period determination. A range of long
periods (>17d) are consistent with the data. We identify a short-period planet
around TOI-1807 with a radius of R$_b$=1.8$pm$0.04$R_oplus$ and a period of
P$_b$=0.549 d. 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 ($R<2R_oplus$) 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 time-scales 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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