Radial velocity confirmation of K2-100b: a young, highly irradiated, and low density transiting hot Neptune
| Autor: | Barragán, O., Aigrain, S., Kubyshkina, D., Gandolfi, D., Livingston, J., Fridlund, M. C. V., Fossati, L., Korth, J., Parviainen, H., Malavolta, L., Palle, E., Deeg, H. J., Nowak, G., Rajpaul, V. M., Zicher, N., Antoniciello, G., Narita, N., Albrecht, S., Bedin, L. R., Cabrera, J., Cochran, W. D., de Leon, J., Eigmüller, Ph., Fukui, A., Granata, V., Grziwa, S., Guenther, E., Hatzes, A. P., Kusakabe, N., Latham, D. W., Libralato, M., Luque, R., Montañés-Rodríguez, P., Murgas, F., Nardiello, D., Pagano, I., Piotto, G., Persson, C. M., Redfield, S., Tamura, M. |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stz2569 |
| Popis: | We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 days. We model the activity-induced radial velocity variations of the host star with a multi-dimensional Gaussian Process framework and detect a planetary signal of $10.6 \pm 3.0 {\rm m\,s^{-1}}$, which matches the transit ephemeris, and translates to a planet mass of $21.8 \pm 6.2 M_\oplus$. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, $2.04^{+0.66}_{-0.61} {\rm g\,cm^{-3}}$, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of $10^{11}-10^{12}\,{\rm g\,s^{-1}}$ due to the high level of radiation it receives from its host star. Comment: Accepted for publications in MNRAS |
| Databáze: | arXiv |
| Externí odkaz: |
|