SIMBAD references

2021AJ....161...56W - Astron. J., 161, 56-56 (2021/February-0)

The TESS-Keck survey. II. An ultra-short-period rocky planet and its siblings transiting the galactic thick-disk star TOI-561.

WEISS L.M., DAI F., HUBER D., BREWER J.M., COLLINS K.A., CIARDI D.R., MATTHEWS E.C., ZIEGLER C., HOWELL S.B., BATALHA N.M., CROSSFIELD I.J.M., DRESSING C., FULTON B., HOWARD A.W., ISAACSON H., KANE S.R., PETIGURA E.A., ROBERTSON P., ROY A., RUBENZAHL R.A., TWICKEN J.D., CLAYTOR Z.R., STASSUN K.G., MacDOUGALL M.G., CHONTOS A., GIACALONE S., DALBA P.A., MOCNIK T., HILL M.L., BEARD C., MURPHY J.M.A., ROSENTHAL L.J., BEHMARD A., VAN ZANDT J., LUBIN J., KOSIAREK M.R., LUND M.B., CHRISTIANSEN J.L., MATSON R.A., BEICHMAN C.A., SCHLIEDER J.E., GONZALES E.J., BRICENO C., LAW N., MANN A.W., COLLINS K.I., EVANS P., FUKUI A., JENSEN E.L.N., MURGAS F., NARITA N., PALLE E., PARVIAINEN H., SCHWARZ R.P., TAN T.-G., ACTON J.S., BRYANT E.M., CHAUSHEV A., GILL S., EIGMULLER P., JENKINS J., RICKER G., SEAGER S. and WINN J.N.

Abstract (from CDS):

We report the discovery of TOI-561, a multiplanet system in the galactic thick disk that contains a rocky, ultra-short-period planet. This bright (V = 10.2) star hosts three small transiting planets identified in photometry from the NASA TESS mission: TOI-561 b (TOI-561.02, P = 0.44 days, Rp = 1.45 ± 0.11 R), c (TOI-561.01, P = 10.8 days, Rp = 2.90 ± 0.13 R), and d (TOI-561.03, P = 16.3 days, Rp = 2.32 ± 0.16 R). The star is chemically ([Fe/H] = -0.41 ± 0.05, [α/Fe] = +0.23 ± 0.05) and kinematically consistent with the galactic thick-disk population, making TOI-561 one of the oldest (10 ± 3 Gyr) and most metal-poor planetary systems discovered yet. We dynamically confirm planets b and c with radial velocities from the W. M. Keck Observatory High Resolution Echelle Spectrometer. Planet b has a mass and density of 3.2 ± 0.8 M and 5.5–1.6+2.0 g cm–3, consistent with a rocky composition. Its lower-than-average density is consistent with an iron-poor composition, although an Earth-like iron-to-silicates ratio is not ruled out. Planet c is 7.0 ± 2.3 M and 1.6 ± 0.6 g cm–3, consistent with an interior rocky core overlaid with a low-mass volatile envelope. Several attributes of the photometry for planet d (which we did not detect dynamically) complicate the analysis, but we vet the planet with high-contrast imaging, ground-based photometric follow-up, and radial velocities. TOI-561 b is the first rocky world around a galactic thick-disk star confirmed with radial velocities and one of the best rocky planets for thermal emission studies.

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

Journal keyword(s): Exoplanets - Exoplanet astronomy - Exoplanet systems - Exoplanet detection methods - Exoplanet structure - Exoplanet formation - Exoplanet evolution

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

Simbad objects: 9

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2021.08.06-04:15:51

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