Universität zu Köln

Korth, J., Csizmadia, Sz., Gandolfi, D., Fridlund, M., Paetzold, M., Hirano, T., Livingston, J., Persson, C. M., Deeg, H. J., Justesen, A. B., Barragan, O., Grziwa, S., Endl, M., Tronsgaard, R., Dai, F., Cochran, W. D., Albrecht, S., Alonso, R., Cabrera, J., Cauley, P. W., Cusano, F., Eigmueller, Ph., Erikson, A., Esposito, M., Guenther, E. W., Hatzes, A. P., Hidalgo, D., Kuzuhara, M., Montanes, P., Napolitano, N. R., Narita, N., Niraula, P., Nespral, D., Nowak, G., Palle, E., Petrillo, C. E., Redfield, S., Prieto-Arranz, J., Rauer, H., Smith, A. M. S., Tortora, C., Van Eylen, V. and Winn, J. N. (2019). K2-140b and K2-180b-Characterization of a hot Jupiter and a mini-Neptune from the K2 mission. Mon. Not. Roy. Astron. Soc., 482 (2). S. 1807 - 1824. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V= 12.6 mag, metal-poor ([Fe/H] = -0.65 +/- 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V= 12.6 mag G6V ([Fe/H] = +0.10 +/- 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of M-p = 11.3 +/- 1.9 M-circle plus and a radius of R-p = 2.2 +/- 0.1R circle plus, yielding a mean density of rho(p) = 5.6 +/- 1.9 g cm(-3), suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Korth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Csizmadia, Sz. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gandolfi, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fridlund, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paetzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hirano, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Livingston, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Persson, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deeg, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Justesen, A. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barragan, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grziwa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endl, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tronsgaard, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dai, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cochran, W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Albrecht, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alonso, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cabrera, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cauley, P. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cusano, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eigmueller, Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Erikson, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Esposito, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guenther, E. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hatzes, A. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hidalgo, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuzuhara, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montanes, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Napolitano, N. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Narita, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Niraula, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nespral, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nowak, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palle, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrillo, C. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Redfield, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prieto-Arranz, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rauer, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, A. M. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tortora, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Van Eylen, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winn, J. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-140523
DOI:	10.1093/mnras/sty2760
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	482
Number:	2
Page Range:	S. 1807 - 1824
Date:	2019
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COOL DWARF STARS; TRANSITING EXTRASOLAR PLANETS; EARTH-SIZED PLANET; VALIDATED PLANETS; RADIAL-VELOCITY; BALMER LINES; SUPER-EARTHS; MASS; MODELS; EVOLUTION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14052