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Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits
Molly R. Kosiarek, Ian J. M. Crossfield, Kevin K. Hardegree-Ullman +36
We report improved masses, radii, and densities for four planets in two bright M-dwarf systems, K2-3 and GJ3470, derived from a combination of new radial velocity and transit obser…
Revisiting the HIP41378 system with K2 and Spitzer
David Berardo, Ian J. M. Crossfield, Michael Werner +12
We present new observations of the multi-planet system HIP~41378, a bright star ( = 8.9, = 7.7) with five known transiting planets. Observations in Campaign 5 of the K2 mi…
Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3
Adam C. Schneider, Kevin K. Hardegree-Ullman, Michael C. Cushing +2
We present Spitzer Space Telescope time-series photometry at 3.6 and 4.5 m of 2MASS J111932541137466AB and WISEA J114724.10204021.3, two planetary-mass, late-type (L…
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b
Courtney D. Dressing, Evan Sinukoff, Benjamin J. Fulton +23
K2-55b is a Neptune-sized planet orbiting a K7 dwarf with a radius of , a mass of , and an effective temperature of $4300^{+1…
Planetary Candidates from K2 Campaign 16
Liang Yu, Ian J. M. Crossfield, Joshua E. Schlieder +20
Given that Campaign 16 of the K2 mission is one of just two K2 campaigns observed so far in "forward-facing" mode, which enables immediate follow-up observations from the ground, w…