SIMBAD references

2021AJ....161..171T - Astron. J., 161, 171-171 (2021/April-0)

TESS hunt for young and maturing exoplanets (THYME). V. A sub-Neptune transiting a young star in a newly discovered 250 Myr association.

TOFFLEMIRE B.M., RIZZUTO A.C., NEWTON E.R., KRAUS A.L., MANN A.W., VANDERBURG A., NELSON T., HAWKINS K., WOOD M.L., ZHOU G., QUINN S.N., HOWELL S.B., COLLINS K.A., SCHWARZ R.P., STASSUN K.G., BOUMA L.G., ESSACK Z., OSBORN H., BOYD P.T., FURESZ G., GLIDDEN A., TWICKEN J.D., WOHLER B., McLEAN B., RICKER G.R., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N. and JENKINS J.M.

Abstract (from CDS):

The detection and characterization of young planetary systems offer a direct path to study the processes that shape planet evolution. We report on the discovery of a sub-Neptune-sized planet orbiting the young star HD 110082 (TOI-1098). Transit events we initially detected during TESS Cycle 1 are validated with time-series photometry from Spitzer. High-contrast imaging and high-resolution, optical spectra are also obtained to characterize the stellar host and confirm the planetary nature of the transits. The host star is a late-F dwarf (M* = 1.2M) with a low-mass, M dwarf binary companion (M* = 0.26M) separated by nearly one arcminute (∼6200 au). Based on its rapid rotation and Lithium absorption, HD 110082 is young, but is not a member of any known group of young stars (despite proximity to the Octans association). To measure the age of the system, we search for coeval, phase-space neighbors and compile a sample of candidate siblings to compare with the empirical sequences of young clusters and to apply quantitative age-dating techniques. In doing so, we find that HD 110082 resides in a new young stellar association we designate MELANGE-1, with an age of 250–70+50 Myr. Jointly modeling the TESS and Spitzer light curves, we measure a planetary orbital period of 10.1827 days and radius of Rp = 3.2 ± 0.1R. HD 110082 b's radius falls in the largest 12% of field-age systems with similar host-star mass and orbital period. This finding supports previous studies indicating that young planets have larger radii than their field-age counterparts.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet astronomy - Exoplanets - Mini Neptunes - Stellar astronomy - Wide binary stars - Moving clusters - Stellar ages - Transits

Status at CDS : Large table(s) of objects being ingested in VizieR.

Simbad objects: 35

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2021.12.08-02:54:40

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