The Warm Neptunes around HD 106315 Have Low Stellar Obliquities

  title={The Warm Neptunes around HD 106315 Have Low Stellar Obliquities},
  author={George Zhou and Joseph E. Rodriguez and Andrew M. Vanderburg and Samuel N. Quinn and Jonathan M. Irwin and Chelsea X. Huang and David W. Latham and Allyson Bieryla and Gilbert A. Esquerdo and Perry L. Berlind and M. Calkins},
  journal={The Astronomical Journal},
We present the obliquity of the warm Neptune HD 106315c measured via a series of spectroscopic transit observations. HD 106315c is a 4.4 REarth warm Neptune orbiting a moderately rotating late F-star with a period of 21.05 days. HD 106315 also hosts a 2.5 REarth super-Earth on a 9.55 day orbit. Our Doppler tomographic analyses of four transits observed by the Magellan/MIKE, HARPS, and TRES facilities find HD 106315c to be in a low stellar obliquity orbit, consistent with being well aligned with… 
A Well-aligned Orbit for the 45 Myr-old Transiting Neptune DS Tuc Ab
DS Tuc Ab is a Neptune-sized planet that orbits around a member of the 45 Myr old Tucana-Horologium moving group. Here, we report the measurement of the sky-projected angle between the stellar spin
EPIC 246851721 b: A Tropical Jupiter Transiting a Rapidly Rotating Star in a Well-aligned Orbit
We report the discovery of EPIC 246851721 b, a "tropical" Jupiter in a 6.18-day orbit around the bright (V=11.439) star EPIC 246851721 (TYC 1283-739-1). We present a detailed analysis of the system
Two Massive Jupiters in Eccentric Orbits from the TESS Full-frame Images
We report the discovery of two short-period massive giant planets from NASA’s Transiting Exoplanet Survey Satellite (TESS). Both systems, TOI-558 (TIC 207110080) and TOI-559 (TIC 209459275), were
HATS-70b: A 13 MJ Brown Dwarf Transiting an A Star
We report the discovery of HATS-70b, a transiting brown dwarf at the deuterium burning limit. HATS-70b has a mass of Mp = 12.9+1.8-1.6 MJup and a radius of Rp 1.384+ 0.074 0.079 MJup, residing in a
TESS Spots a Compact System of Super-Earths around the Naked-eye Star HR 858
Transiting Exoplanet Survey Satellite (TESS) observations have revealed a compact multi-planet system around the sixth-magnitude star HR 858 (TIC 178155732, TOI 396), located 32 parsecs away. Three
Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS
Planets around young stars trace the early evolution of planetary systems. We report the discovery and validation of two planetary systems with ages ≾300 Myr from observations by the Transiting
Revisiting the Full Sets of Orbital Parameters for the XO-3 System: No Evidence for Temporal Variation of the Spin–Orbit Angle
We present 12 new transit light curves and 16 new out-of-transit radial-velocity measurements for the XO-3 system. By modeling our newly collected measurements together with archival photometric and
KELT-24b: A 5M J Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148
Harvard Future Faculty Leaders Postdoctoral fellowship; Space Telescope Science InstituteSpace Telescope Science Institute [HST-HF2-51402.001-A]; Vanderbilt Office of the Provost through the
Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602
We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA TESS mission, the ESA Gaia mission, ground-based photometry from El
TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images
We present the discovery and characterization of five hot and warm Jupiters—TOI-628 b (TIC 281408474; HD 288842), TOI-640 b (TIC 147977348), TOI-1333 b (TIC 395171208, BD+47 3521A), TOI-1478 b (TIC


We measure the sky-projected stellar obliquities (λ) in the multiple-transiting planetary systems KOI-94 and Kepler-25, using the Rossiter-McLaughlin effect. In both cases, the host stars are well
A Multi-planet System Transiting the V = 9 Rapidly Rotating F-Star HD 106315
We report the discovery of a multi-planet system orbiting HD 106315, a rapidly rotating mid F-type star, using data from the K2 mission. HD 106315 hosts a $2.51\pm0.12\,R_\oplus$ sub-Neptune in a 9.5
The Oblique Orbit of WASP-107b from K2 Photometry
Observations of nine transits of WASP-107 during the {\it K2} mission reveal three separate occasions when the planet crossed in front of a starspot. The data confirm the stellar rotation period to
We report the discovery of the first hot Jupiter in the Hyades open cluster. HD 285507b orbits a V = 10.47 K4.5V dwarf (M * = 0.734 M ☉; R * = 0.656 R ☉) in a slightly eccentric () orbit with a
The oblique orbit of the super-Neptune HAT-P-11b
We find the orbit of the Neptune-sized exoplanet HAT-P-11b to be highly inclined relative to the equatorial plane of its host star. This conclusion is based on spectroscopic observations of two
Results on the obliquity of exoplanet host stars?the angle between the stellar spin axis and the planetary orbital axis?provide important diagnostic information for theories describing planetary
Two Small Transiting Planets and a Possible Third Body Orbiting HD 106315
The masses, atmospheric makeups, spin–orbit alignments, and system architectures of extrasolar planets can be best studied when the planets orbit bright stars. We report the discovery of three bodies
Ground-based photometry of the 21-day Neptune HD106315c
Space-based transit surveys such as K2 and TESS allow the detection of small transiting planets with orbital periods beyond 10 days. Few of these warm Neptunes are currently known around stars bright
Orbital misalignment of the Neptune-mass exoplanet GJ 436b with the spin of its cool star
Three-dimensional characterization of the trajectory of an exoplanet around an M dwarf star is reported, derived by mapping the spectrum of the stellar photosphere along the chord transited by the planet.
Precise masses for the transiting planetary system HD 106315 with HARPS
The multi-planetary system HD 106315 was recently found in K2 data . The planets have periods of $P_b \sim9.55$ and $P_c \sim 21.06\,$days, and radii of $ r_b = 2.44 \pm 0.17\, $ and $r_c = 4.35 \pm