Vanderburg, A, Montet, BT, Johnson, JA, Buchhave, LA, Zeng, L, Pepe, F, Cameron, AC, Latham, DW, Molinari, E, Udry, S, Lovis, C, Matthews, JM, Cameron, C, Law, N, Bowler, BP, Angus, R, Baranec, C, Bieryla, A, Boschin, W, Charbonneau, D, Cosentino, R, Dumusque, X, Figueira, P, Guenther, DB, Harutyunyan, A, Hellier, C, Kuschnig, R, Lopez-Morales, M, Mayor, M, Micela, G, Moffat, AFJ, Pedani, M, Phillip, DF, Piotto, G, Pollacco, D, Queloz, D, Rice, K, Riddle, R, Rowe, JF, Rucinski, SM, Sasselov, D, Segransan, D, Sozzetti, A, Szentgyorgyi, A, Watson, C and Weiss, WW (2015) Characterizing K2 Planet Discoveries: A Super-earth Transiting The Bright K Dwarf HIP 116454. Astrophysical Journal, 800 (1). ISSN 0004-637X

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We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 ± 5.4 pc. Based on high-resolution optical spectroscopy, we find that the host star is metal-poor with [Fe/H] =–0.16 ± 0.08 and has a radius R sstarf = 0.716 ± 0.024 R ☉ and mass M sstarf = 0.775 ± 0.027 M ☉. The star was observed by the Kepler spacecraft during its Two-Wheeled Concept Engineering Test in 2014 February. During the 9 days of observations, K2 observed a single transit event. Using a new K2 photometric analysis technique, we are able to correct small telescope drifts and recover the observed transit at high confidence, corresponding to a planetary radius of Rp = 2.53 ± 0.18 R ⊕. Radial velocity observations with the HARPS-N spectrograph reveal a 11.82 ± 1.33 M ⊕ planet in a 9.1 day orbit, consistent with the transit depth, duration, and ephemeris. Follow-up photometric measurements from the MOST satellite confirm the transit observed in the K2 photometry and provide a refined ephemeris, making HIP 116454 b amenable for future follow-up observations of this latest addition to the growing population of transiting super-Earths around nearby, bright stars.

Item Type: Article
Additional Information: This work is made available online in accordance with publisher policies
Uncontrolled Keywords: planets and satellites: detection; techniques: photometric
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 03 Nov 2016 11:00
Last Modified: 01 Apr 2019 10:21

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