TESS-Keck Survey. XIII. TOI-1272 radial velocity

DOI

We report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of 3.3days and Rp,b=4.1{+/-}0.2R{Earth}, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. Using ground-based radial velocity (RV) measurements from the HIRES instrument at the Keck Observatory, we measured the mass of TOI-1272b to be Mp,b=25{+/-}2M{Earth}. We also confirmed a high eccentricity of eb=0.34{+/-}0.06, placing TOI-1272b among the most eccentric well-characterized sub-Jovians. We used these RV measurements to also identify a non-transiting outer companion on an 8.7day orbit with a similar mass of Mp,csin(i)=27{+/-}3M{Earth} and ec<~0.35. Dynamically stable planet-planet interactions have likely allowed TOI-1272b to avoid tidal eccentricity decay despite the short circularization timescale expected for a close-in eccentric Neptune. TOI-1272b also maintains an envelope mass fraction of fenv~11% despite its high equilibrium temperature, implying that it may currently be undergoing photoevaporation. This planet joins a small population of short-period Neptune-like planets within the "Hot Neptune Desert" with a poorly understood formation pathway.

Identifier
DOI http://doi.org/10.26093/cds/vizier.51640097
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/AJ/164/97
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/164/97
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/164/97
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/164/97
Provenance
Creator MacDougall M.G.; Petigura E.A.; Fetherolf T.; Beard C.; Lubin J.; Angelo I.,Batalha N.M.; Behmard A.; Blunt S.; Brinkman C.; Chontos A.,Crossfield I.J.M.; Dai F.; Dalba P.A.; Dressing C.; Fulton B.; Giacalone S.,Hill M.L.; Howard A.W.; Huber D.; Isaacson H.; Kane S.R.; Kosiarek M.,Mayo A.; Mocnik T.; Akana Murphy J.M.; Pidhorodetska D.; Polanski A.,Rice M.; Robertson P.; Rosenthal L.J.; Roy A.; Rubenzahl R.A.; Scarsdale N.,Turtelboom E.V.; Tyler D.; Van Zandt J.; Weiss L.M.; Esparza-Borges E.,Fukui A.; Isogai K.; Kawauchi K.; Mori M.; Murgas F.; Narita N.,Nishiumi T.; Palle E.; Parviainen H.; Watanabe N.; Jenkins J.M.,Latham D.W.; Ricker G.R.; Seager S.; Vanderspek R.K.; Winn J.N.; Bieryla A.,Caldwell D.A.; Dragomir D.,Fausnaugh M.M.; Mireles I.; Rodriguez D.R.
Publisher CDS
Publication Year 2022
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Exoplanet Astronomy; Galactic and extragalactic Astronomy; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics