Publications (21)
The Differential Rotation of Kappa1 Ceti as Observed by MOST
Gordon A. H. Walker, Bryce Croll, Rainer Kuschnig +7
We first reported evidence for differential rotation of Kappa1 Ceti in Paper I. In this paper we demonstrate that the differential rotation pattern closely matches that for the Sun…
Looking for Giant Earths in the HD 209458 System: A Search for Transits in MOST Space-based Photometry
Bryce Croll, Jaymie M. Matthews, Jason F. Rowe +11
We have made a comprehensive transit search for exoplanets down to about 2 Earth radii in the HD 209458 system, based on nearly uninterrupted broadband optical photometry obtained…
Multiwavelength Transit Observations of the Candidate Disintegrating Planetesimals Orbiting WD 1145+017
Bryce Croll, Paul A. Dalba, Andrew Vanderburg +12
We present multiwavelength, multi-telescope, ground-based follow-up photometry of the white dwarf WD 1145+017, that has recently been suggested to be orbited by up to six or more,…
Near-infrared Thermal Emission from WASP-12b: detections of the secondary eclipse in Ks, H & J
Bryce Croll, David Lafreniere, Loic Albert +3
We present Ks, H & J-band photometry of the very highly irradiated hot Jupiter WASP-12b using the Wide-field Infrared Camera on the Canada-France-Hawaii telescope. Our photometry b…
Near-Infrared InGaAs Detectors for Background-limited Imaging and Photometry
Peter W. Sullivan, Bryce Croll, Robert A. Simcoe
Originally designed for night-vision equipment, InGaAs detectors are beginning to achieve background-limited performance in broadband imaging from the ground. The lower cost of the…
Kepler Transit Depths Contaminated by a Phantom Star
Paul A. Dalba, Philip S. Muirhead, Bryce Croll +1
We present ground-based observations from the Discovery Channel Telescope (DCT) of three transits of Kepler-445c---a supposed super-Earth exoplanet with properties resembling GJ 12…
Near-infrared Thermal Emission Detections of a number of hot Jupiters and the Systematics of Ground-based Near-infrared Photometry
Bryce Croll, Loic Albert, Ray Jayawardhana +7
We present detections of the near-infrared thermal emission of three hot Jupiters and one brown-dwarf using the Wide-field Infrared Camera (WIRCam) on the Canada-France-Hawaii Tele…
Radial Velocity Studies of Close Binary Stars. XIV
Theodor Pribulla, Slavek M. Rucinski, Heide DeBond +7
Radial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for ten close binary systems: TZ Boo, VW Boo, EL Boo, VZ CVn, GK Cep, RW Co…
Dust Distribution in the beta Pictoris Circumstellar Disks
Mirza Ahmic, Bryce Croll, Pawel Artymowicz
We present 3-D models of dust distribution around beta Pictoris that produce the best fits to the Hubble Space Telescope Advanced Camera for Surveys' (HST/ACS) images obtained by G…
The Relation between the Transit Depths of KIC 12557548b & the Stellar Rotation Period
Bryce Croll, Saul Rappaport, Alan M. Levine
Kawahara and collaborators analyzed the transits of the candidate disintegrating Mercury-mass planet KIC 12557548b and suggested that the transit depths were correlated with the ph…
MOST detects variability on tau Bootis possibly induced by its planetary companion
Gordon A. H. Walker, Bryce Croll, Jaymie M. Matthews +8
(abridged) There is considerable interest in the possible interaction between parent stars and giant planetary companions in 51 Peg-type systems. We demonstrate from MOST satellite…
Tracking the Stellar Longitudes of Starspots in Short-Period Kepler Binaries
Bhaskaran Balaji, Bryce Croll, Alan M. Levine +1
We report on a new method for tracking the phases of the orbital modulations in very short-period, near-contact, and contact binary systems systems in order to follow starspots. We…
Long-term, Multiwavelength Light Curves of Ultra-Cool Dwarfs: II. The evolving Light Curves of the T2.5 SIMP 0136 & the Uncorrelated Light Curves of the M9 TVLM 513
Bryce Croll, Philip S. Muirhead, Jack Lichtman +3
We present 17 nights of ground-based, near-infrared photometry of the variable L/T transition brown dwarf SIMP J013656.5+093347 and an additional 3 nights of ground-based photometr…
Long-term, Multiwavelength Light Curves of Ultra-cool Dwarfs: I. An Interplay of Starspots & Clouds Likely Drive the Variability of the L3.5 dwarf 2MASS 0036+18
Bryce Croll, Philip S. Muirhead, Eunkyu Han +5
We present multi-telescope, ground-based, multiwavelength optical and near-infrared photometry of the variable L3.5 ultra-cool dwarf 2MASSW J0036159+182110. We present 22 nights of…
Broadband Transmission Spectroscopy of the super-Earth GJ 1214b suggests a Low Mean Molecular Weight Atmosphere
Bryce Croll, Loic Albert, Ray Jayawardhana +4
We used WIRCam on CFHT to observe four transits of the super-Earth GJ 1214b in the near-infrared. For each transit we observed in two bands nearly-simultaneously by rapidly switchi…
Near-Infrared Thermal Emission from TrES-3b: A Ks-band detection and an H-band upper limit on the depth of the secondary eclipse
Bryce Croll, Ray Jayawardhana, Jonathan J. Fortney +2
We present H and Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-3b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope. We detec…
Multiwavelength Observations of the Candidate Disintegrating sub-Mercury KIC 12557548b
Bryce Croll, Saul Rappaport, John DeVore +11
We present multiwavelength photometry, high angular resolution imaging, and radial velocities, of the unique and confounding disintegrating low-mass planet candidate KIC 12557548b.…
Precision of a Low-Cost InGaAs Detector for Near Infrared Photometry
Peter W. Sullivan, Bryce Croll, Robert A. Simcoe
We have designed, constructed, and tested an InGaAs near-infrared camera to explore whether low-cost detectors can make small (<1 m) telescopes capable of precise (<1 mmag) infrare…
Looking for Super-Earths in the HD 189733 System: A Search for Transits in Most Space-Based Photometry
Bryce Croll, Jaymie M. Matthews, Jason F. Rowe +10
We have made a comprehensive transit search for exoplanets down to ~1.5 - 2 Earth radii in the HD 189733 system, based on 21-days of nearly uninterrupted broadband optical photomet…
Search for Rayleigh scattering in the atmosphere of GJ1214b
Ernst J. W. de Mooij, Matteo Brogi, Remco J. de Kok +8
We investigate the atmosphere of GJ1214b, a transiting super-Earth planet with a low mean density, by measuring its transit depth as a function of wavelength in the blue optical po…
Near-Infrared Thermal Emission from the Hot Jupiter TrES-2b: Ground-Based Detection of the Secondary Eclipse
Bryce Croll, Loic Albert, David Lafrenière +2
We present near-infrared Ks-band photometry bracketing the secondary eclipse of the hot Jupiter TrES-2b using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope.…