TOI-1272c , the SIMBAD biblio

2022AJ....164...97M - Astron. J., 164, 97 (2022/September-0)

The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around TOI-1272.

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., MURPHY J.M.A., 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. and RODRIGUEZ D.R.

Abstract (from CDS):

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 Rp,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 Mp,b = 25 ± 2 M. 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 8.7 day orbit with a similar mass of Mp,c sin i = 27 ± 3 M 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.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Eccentricity - Hot Neptunes

Status at CDS : Associated data (images, light curves, etc...) being ingested in VizieR.

Simbad objects: 12

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2022.12.08-21:42:05

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