Doppler monitoring of five k2 transiting planetary systems

Dai, Fei and Winn, Joshua N. and Albrecht, Simon and Arriagada, Pamela and Bieryla, Allyson and Butler, R. Paul and Crane, Jeffrey D. and Hirano, Teriyaki and Johnson, John Asher and Kiilerich, Amanda and Latham, David W. and Narita, Norio and Nowak, Grzegorz and Palle, Enric and Ribas, Ignasi and Rogers, Leslie A. and Sanchis-Ojeda, Roberto and Schectman, Stephen A. and Teske, Johanna K. and Thompson, Ian B. and Van Eylen, Vincent and Vanderburg, Andrew and Wittenmyer, Robert A. and Yu, Liang (2016) Doppler monitoring of five k2 transiting planetary systems. The Astrophysical Journal, 823 (2). ISSN 0004-637X

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In an effort to measure the masses of planets discovered by the NASA K2 mission, we have conducted precise Doppler observations of five stars with transiting planets. We present the results of a joint analysis of these new data and previously published Doppler data. The first star, an M dwarf known as K2-3 or EPIC 201367065, has three transiting planets (“b,” with radius 2.1 R⊕; “c,” 1.7 R⊕; and “d,” 1.5 R⊕). Our analysis leads to the mass constraints:

Mb = 8.1 -1.9 to +2.0 M⊕
and Mc < 4.2 M⊕ (95% confidence).

The mass of planet d is poorly constrained because its orbital period is close to the stellar rotation period, making it difficult to disentangle the planetary signal
from spurious Doppler shifts due to stellar activity. The second star, a G dwarf known as K2-19 or EPIC 201505350, has two planets (“b,” 7.7 R⊕; and “c,” 4.9 R⊕) in a 3:2 mean-motion resonance, as well as a shorter period
planet (“d,” 1.1 R⊕). We find

Mb = 28.5 -5.0 to +5.4 M⊕,
Mc = 25.6 -7.1 to + 7.1 M⊕
and Md < 14.0M⊕ (95% conf.).

The third star, a G dwarf known as K2-24 or EPIC 203771098, hosts two transiting planets (“b,” 5.7 R⊕; and “c,” 7.8 R⊕) with orbital periods in a nearly 2:1 ratio. We find

Mb = 19.8 -4.4 to +4.5 M⊕ and
Mc = 26.0 -6.1 to +5.8 M⊕.

The fourth star, a G dwarf known as EPIC 204129699, hosts a hot Jupiter for which we measured the mass to be

1.857 +0.081 to -0.081 MJup.

The fifth star, a G dwarf known as EPIC 205071984, contains three transiting planets (“b,” 5.4 R⊕; “c,” 3.5 R⊕; and “d,” 3.8 R⊕), the outer two of which have a nearly 2:1 period ratio. We find

Mb = 21.1 -5.9 to +5.9 M⊕,
Mc < 8.1 M⊕ (95% conf.) and
Md < 35M⊕ (95% conf.).

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 21 Mar 2017 23:54
Last Modified: 06 Apr 2017 06:23
Uncontrolled Keywords: planets and satellites; composition; radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/0004-637X/823/2/115

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