SIMBAD references

2016AJ....152..143V - Astron. J., 152, 143-143 (2016/November-0)

The K2-ESPRINT project V: a short-period giant planet orbiting a subgiant star.

VAN EYLEN V., ALBRECHT S., GANDOLFI D., DAI F., WINN J.N., HIRANO T., NARITA N., BRUNTT H., PRIETO-ARRANZ J., BEJAR V.J.S., NOWAK G., LUND M.N., PALLE E., RIBAS I., SANCHIS-OJEDA R., YU L., ARRIAGADA P., BUTLER R.P., CRANE J.D., HANDBERG R., DEEG H., JESSEN-HANSEN J., JOHNSON J.A., NESPRAL D., ROGERS L., RYU T., SHECTMAN S., SHROTRIYA T., SLUMSTRUP D., TAKEDA Y., TESKE J., THOMPSON I., VANDERBURG A. and WITTENMYER R.

Abstract (from CDS):

We report on the discovery and characterization of the transiting planet K2-39b (EPIC 206247743b). With an orbital period of 4.6 days, it is the shortest-period planet orbiting a subgiant star known to date. Such planets are rare, with only a handful of known cases. The reason for this is poorly understood but may reflect differences in planet occurrence around the relatively high-mass stars that have been surveyed, or may be the result of tidal destruction of such planets. K2-39 (EPIC 206247743) is an evolved star with a spectroscopically derived stellar radius and mass of 3.88–0.42+0.48 R and 1.53–0.12+0.13 M, respectively, and a very close-in transiting planet, with a/R*=3.4. Radial velocity (RV) follow-up using the HARPS, FIES, and PFS instruments leads to a planetary mass of 50.3–9.4+9.7 M. In combination with a radius measurement of 8.3±1.1 R, this results in a mean planetary density of 0.50–0.17+0.29 g cm–3. We furthermore discover a long-term RV trend, which may be caused by a long-period planet or stellar companion. Because K2-39b has a short orbital period, its existence makes it seem unlikely that tidal destruction is wholly responsible for the differences in planet populations around subgiant and main-sequence stars. Future monitoring of the transits of this system may enable the detection of period decay and constrain the tidal dissipation rates of subgiant stars.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): planetary systems - planets and satellites: detection - planets and satellites: dynamical evolution and stability - stars: fundamental parameters - stars: individual: K2-39 - stars: individual: K2-39

Simbad objects: 20

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2021.06.17-22:37:22

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