184 citations · 1.8k across the 52 of their papers we have counts for
27 papers · 1 filter
The Extreme Stellar-Signals Project III. Combining Solar Data from HARPS, HARPS-N, EXPRES, and NEID
Lily L. Zhao, Xavier Dumusque, Eric B. Ford +37
We present an analysis of Sun-as-a-star observations from four different high-resolution, stabilized spectrographs -- HARPS, HARPS-N, EXPRES, and NEID. With simultaneous observatio…
EXPRES IV: Two Additional Planets Orbiting Coronae Borealis Reveal Uncommon System Architecture
John M. Brewer, Lily L. Zhao, Debra A. Fischer +7
Thousands of exoplanet detections have been made over the last twenty-five years using Doppler observations, transit photometry, direct imaging, and astrometry. Each of these metho…
Measured Spin-Orbit Alignment of Ultra-Short Period Super-Earth 55 Cancri e
Lily L. Zhao, Vedad Kunovac, John M. Brewer +8
A planet's orbital alignment places important constraints on how a planet formed and consequently evolved. The dominant formation pathway of ultra-short period planets ( day)…
A Radiative-Convective Model for Terrestrial Planets with Self-Consistent Patchy Clouds
James D. Windsor, Tyler D. Robinson, Ravi kumar Kopparapu +3
Clouds are ubiquitous\, -- \,they arise for every solar system planet that possesses an atmosphere and have also been suggested as a leading mechanism for obscuring spectral featur…
The EXPRES Stellar Signals Project II. State of the Field in Disentangling Photospheric Velocities
Lily L. Zhao, Debra A. Fischer, Eric B. Ford +40
Measured spectral shifts due to intrinsic stellar variability (e.g., pulsations, granulation) and activity (e.g., spots, plages) are the largest source of error for extreme precisi…
EXPRES. III. Revealing the Stellar Activity Radial Velocity Signature of Eridani with Photometry and Interferometry
Rachael M. Roettenbacher, Samuel H. C. Cabot, Debra A. Fischer +20
The distortions of absorption line profiles caused by photospheric brightness variations on the surfaces of cool, main-sequence stars can mimic or overwhelm radial velocity (RV) sh…
TESS Hunt for Young and Maturing Exoplanets (THYME) VI: an 11 Myr giant planet transiting a very low-mass star in Lower Centaurus Crux
Andrew W. Mann, Mackenna L. Wood, Stephen P. Schmidt +48
Mature super-Earths and sub-Neptunes are predicted to be Jovian radius when younger than 10 Myr. Thus, we expect to find 5-15 planets around young stars even if t…
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
Nora L. Eisner, Belinda A. Nicholson, Oscar Barragán +37
We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 , 1.15 , TOI 2319) using data from NASA's…
EXPRES. II. Searching for Planets Around Active Stars: A Case Study of HD 101501
Samuel H. C. Cabot, Rachael M. Roettenbacher, Gregory W. Henry +7
By controlling instrumental errors to below 10 cm/s, the EXtreme PREcision Spectrograph (EXPRES) allows for a more insightful study of photospheric velocities that can mask weak Ke…
EXPRES I. HD~3651 an Ideal RV Benchmark
John M. Brewer, Debra A. Fischer, Ryan T. Blackman +10
The next generation of exoplanet-hunting spectrographs should deliver up to an order of magnitude improvement in radial velocity precision over the standard 1 m/s state of the art.…
MOVES III. Simultaneous X-ray and ultraviolet observations unveiling the variable environment of the hot Jupiter HD 189733b
V. Bourrier, P. J. Wheatley, A. Lecavelier des Etangs +8
In this third paper of the MOVES (Multiwavelength Observations of an eVaporating Exoplanet and its Star) programme, we combine Hubble Space Telescope far-ultraviolet observations w…
Asteroid Photometry from the Transiting Exoplanet Survey Satellite: A Pilot Study
A. McNeill, M. Mommert, D. E. Trilling +2
The {\it Transiting Exoplanet Survey Satellite} (TESS) searches for planets transiting bright and nearby stars using high-cadence, large-scale photometric observations. Full Frame…
Magnetic field strengths of hot Jupiters from signals of star-planet interactions
P. Wilson Cauley, Evgenya L. Shkolnik, Joe Llama +1
Evidence of star-planet interactions in the form of planet-modulated chromospheric emission has been noted for a number of hot Jupiters. Magnetic star-planet interactions involve t…
CO Detected in CI Tau b: Hot Start Implied by Planet Mass and M
Laura Flagg, Christopher M. Johns-Krull, Larissa Nofi +5
We acquired high resolution IR spectra of CI Tau, the host star of one of the few young planet candidates amenable to direct spectroscopic detection. We confirm the planet's existe…
A New Two-Molecule Combination Band as Diagnostic of Carbon Monoxide Diluted in Nitrogen Ice On Triton
S. C. Tegler, T. D. Stufflebeam, W. M. Grundy +11
A combination band due to a mechanism whereby a photon excites two or more vibrational modes ({\it e.g.} a bend and a stretch) of an individual molecule is commonly seen in laborat…
Evidence of magnetic star-planet interactions in the HD 189733 system from orbitally-phased Ca II K variations
P. Wilson Cauley, Evgenya L. Shkolnik, Joe Llama +2
Magnetic star-planet interactions (SPI) provide a detection method and insight into exoplanet magnetic fields and, in turn, exoplanet interiors and atmospheric environments. These…
The effects of stellar activity on optical high-resolution exoplanet transmission spectra
Paul Wilson Cauley, Christoph Kuckein, Seth Redfield +4
Chromospherically sensitive atomic lines display different spectra in stellar active regions, spots, and the photosphere, raising the possibility that exoplanet transmission spectr…
Transit time derivation for hot planet bow-shocks
P. Wilson Cauley, Evgenya L. Shkolnik, Joe Llama
We present an analytical estimate of hot planet bow-shock transit times that will be useful for planning observations of such signatures.
Understanding Stellar Contamination in Exoplanet Transmission Spectra as an Essential Step in Small Planet Characterization
Dániel Apai, Benjamin V. Rackham, Mark S. Giampapa +18
Transmission spectroscopy during planetary transits is expected to be a major source of information on the atmospheres of small (approximately Earth-sized) exoplanets in the next t…
K2 reveals pulsed accretion driven by the 2 Myr old hot Jupiter CI Tau b
Lauren I. Biddle, Christopher M. Johns-Krull, Joe Llama +2
CI Tau is a young (~2 Myr) classical T Tauri star located in the Taurus star forming region. Radial velocity observations indicate it hosts a Jupiter-sized planet with an orbital p…
Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra
Robert T. Zellem, Mark R. Swain, Gael Roudier +8
Exoplanet host star activity, in the form of unocculted star spots or faculae, alters the observed transmission and emission spectra of the exoplanet. This effect can be exacerbate…
Discovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities
S. C. C. Barros, D. J. A. Brown, G. Hébrard +37
We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP survey, {\it SOPHIE} and {\it CORALIE}. The planetary nature of the systems was…
The Sun as a planet-host star: Proxies from SDO images for HARPS radial-velocity variations
R. D. Haywood, A. Collier Cameron, Y. C. Unruh +11
The Sun is the only star whose surface can be directly resolved at high resolution, and therefore constitutes an excellent test case to explore the physical origin of stellar radia…
Transiting the Sun II: The impact of stellar activity on Lyman- transits
J Llama, E. L. Shkolnik
High-energy observations of the Sun provide an opportunity to test the limits of our ability to accurately measure properties of transiting exoplanets in the presence of stellar ac…