Bibcode
MacDougall, Mason G.; Petigura, Erik A.; Fetherolf, Tara; Beard, Corey; Lubin, Jack; Angelo, Isabel; Batalha, Natalie M.; Behmard, Aida; Blunt, Sarah; Brinkman, Casey; Chontos, Ashley; Crossfield, Ian J. M.; Dai, Fei; Dalba, Paul A.; Dressing, Courtney; Fulton, Benjamin; Giacalone, Steven; Hill, Michelle L.; Howard, Andrew W.; Huber, Daniel; Isaacson, Howard; Kane, Stephen R.; Kosiarek, Molly; Mayo, Andrew; Močnik, Teo; Akana Murphy, Joseph M.; Pidhorodetska, Daria; Polanski, Alex; Rice, Malena; Robertson, Paul; Rosenthal, Lee J.; Roy, Arpita; Rubenzahl, Ryan A.; Scarsdale, Nicholas; Turtelboom, Emma V.; Tyler, Dakotah; Van Zandt, Judah; Weiss, Lauren M.; Esparza-Borges, Emma; Fukui, Akihiko; Isogai, Keisuke; Kawauchi, Kiyoe; Mori, Mayuko; Murgas, Felipe; Narita, Norio; Nishiumi, Taku; Palle, Enric; Parviainen, Hannu; Watanabe, Noriharu; Jenkins, Jon M.; Latham, David W.; Ricker, George R.; Seager, S.; Vanderspek, Roland K.; Winn, Joshua N.; Bieryla, Allyson; Caldwell, Douglas A.; Dragomir, Diana; Fausnaugh, M. M.; Mireles, Ismael; Rodriguez, David R.
Bibliographical reference
The Astronomical Journal
Advertised on:
9
2022
Citations
3
Refereed citations
2
Description
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 3.3 days and R p,b = 4.1 ± 0.2 R ⊕, 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 M p,b = 25 ± 2 M ⊕. We also confirmed a high eccentricity of e b = 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 8.7 day orbit with a similar mass of M p,c sin i = 27 ± 3 M ⊕ and e c ≲ 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 f env ≍ 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.
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The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago