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The First Circumbinary Planet Found By Microlensing: Ogle-2007-Blg-349l(Ab)C, D. P. Bennett, S. H. Rhie, A. Udalski, A. Gould, Y. Tsapras, D. Kubas, I. A. Bond, J. Greenhill, A. Cassan, N. J. Rattenbury, T. S. Boyajian, J. Luhn, M. T. Penny, J. Anderson, F. Abe, A. Bhattacharya, C. S. Botzler, M. Donachie, M. Freeman, A. Fukui, Y. Hirao, Y. Itow, N. Koshimoto, M. C.A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, H. Oyokawa, Y. C. Perrott, To Saito
The First Circumbinary Planet Found By Microlensing: Ogle-2007-Blg-349l(Ab)C, D. P. Bennett, S. H. Rhie, A. Udalski, A. Gould, Y. Tsapras, D. Kubas, I. A. Bond, J. Greenhill, A. Cassan, N. J. Rattenbury, T. S. Boyajian, J. Luhn, M. T. Penny, J. Anderson, F. Abe, A. Bhattacharya, C. S. Botzler, M. Donachie, M. Freeman, A. Fukui, Y. Hirao, Y. Itow, N. Koshimoto, M. C.A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, H. Oyokawa, Y. C. Perrott, To Saito
Faculty Publications
We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M L ≈ 0.7 M⊙. Hubble Space Telescope …
Is The Galactic Bulge Devoid Of Planets?, Matthew T. Penny, Calen B. Henderson, Christian Clanton
Is The Galactic Bulge Devoid Of Planets?, Matthew T. Penny, Calen B. Henderson, Christian Clanton
Faculty Publications
We consider a sample of 31 exoplanetary systems detected by gravitational microlensing and investigate whether or not the estimated distances to these systems conform to the Galactic distribution of planets expected from models. We derive the expected distribution of distances and relative proper motions from a simulated microlensing survey, correcting for the dominant selection effects that affect the sensitivity of planet detection as a function of distance, and compare it to the observed distribution using Anderson-Darling (AD) hypothesis testing. Taking the relative abundance of planets in the bulge to that in the disk, fbulge, as a model parameter, we find …
Three Temperate Neptunes Orbiting Nearby Stars, Benjamin J. Fulton, Andrew W. Howard, Lauren M. Weiss, Evan Sinukoff, Erik A. Petigura, Howard Isaacson, Lea Hirsch, Geoffrey W. Marcy, Gregory W. Henry, Samuel K. Grunblatt, Daniel Huber, Kaspar Von Braun, Tabetha S. Boyajian, Stephen R. Kane, Justin Wittrock, Elliott P. Horch, David R. Ciardi, Steve B. Howell, Jason T. Wright, Eric B. Ford
Three Temperate Neptunes Orbiting Nearby Stars, Benjamin J. Fulton, Andrew W. Howard, Lauren M. Weiss, Evan Sinukoff, Erik A. Petigura, Howard Isaacson, Lea Hirsch, Geoffrey W. Marcy, Gregory W. Henry, Samuel K. Grunblatt, Daniel Huber, Kaspar Von Braun, Tabetha S. Boyajian, Stephen R. Kane, Justin Wittrock, Elliott P. Horch, David R. Ciardi, Steve B. Howell, Jason T. Wright, Eric B. Ford
Faculty Publications
We present the discovery of three modestly irradiated, roughly Neptune-mass planets orbiting three nearby Solartype stars. HD 42618 b has a minimum mass of 15.4±2.4 M⊕, a semimajor axis of 0.55 au, an equilibrium temperature of 337 K, and is the first planet discovered to orbit the solar analogue host star, HD 42618. We also discover new planets orbiting the known exoplanet host stars HD 164922 and HD 143761 (p CrB). The new planet orbiting HD 164922 has a minimum mass of 12.9±1.6 M⊕ and orbits interior to the previously known Jovian mass planet orbiting at 2.1 au. HD 164922 …
Caustic Structures And Detectability Of Circumbinary Planets In Microlensing, Jacob K. Luhn, Matthew T. Penny, B. Scott Gaudi
Caustic Structures And Detectability Of Circumbinary Planets In Microlensing, Jacob K. Luhn, Matthew T. Penny, B. Scott Gaudi
Faculty Publications
Recent discoveries of circumbinary planets in Kepler data show that there is a viable channel of planet formation around binary main-sequence stars. Motivated by these discoveries, we have investigated the caustic structures and detectability of circumbinary planets in microlensing events. We have produced a suite of animations of caustics as a function of the projected separation and angle of the binary host to efficiently explore caustic structures over the entire circumbinary parameter space. Aided by these animations, we have derived a semi-empirical analytic expression for the location of planetary caustics, which are displaced in circumbinary lenses relative to those of …
The Age Of The Directly Imaged Planet Host Star Κ Andromedae Determined From Interferometric Observations, Jeremy Jones, R. J. White, S. Quinn, M. Ireland, T. Boyajian, G. Schaefer, E. K. Baines
The Age Of The Directly Imaged Planet Host Star Κ Andromedae Determined From Interferometric Observations, Jeremy Jones, R. J. White, S. Quinn, M. Ireland, T. Boyajian, G. Schaefer, E. K. Baines
Faculty Publications
κ Andromedae, an early-type star that hosts a directly imaged low-mass companion, is expected to be oblate due to its rapid rotational velocity (v sin i = ∼162 km s-1). We observed the star with the CHARA Array's optical beam combiner, PAVO, measuring its size at multiple orientations and determining its oblateness. The interferometric measurements, combined with photometry and this v sin i value are used to constrain an oblate star model that yields the fundamental properties of the star and finds a rotation speed that is ∼85% of the critical rate and a low inclination of ∼30°. Three modeled …
Planetary Candidates Observed By Kepler. Vii. The First Fully Uniform Catalog Based On The Entire 48-Month Data Set (Q1-Q17 Dr24), Jeffrey L. Coughlin, F. Mullally, Susan E. Thompson, Jason F. Rowe, Christopher J. Burke, David W. Latham, Natalie M. Batalha, Aviv Ofir, Billy L. Quarles, Christopher E. Henze, Angie Wolfgang, Douglas A. Caldwell, Stephen T. Bryson, Avi Shporer, Joseph Catanzarite, Rachel Akeson, Thomas Barclay, William J. Borucki, Tabetha S. Boyajian, Jennifer R. Campbell, Jessie L. Christiansen, Forrest R. Girouard, Michael R. Haas, Steve B. Howell, Daniel Huber, Jon M. Jenkins, Jie Li, Anima Patil-Sabale, Elisa V. Quintana, Solange Ramirez, Shawn Seader, Jeffrey C. Smith, Peter Tenenbaum
Planetary Candidates Observed By Kepler. Vii. The First Fully Uniform Catalog Based On The Entire 48-Month Data Set (Q1-Q17 Dr24), Jeffrey L. Coughlin, F. Mullally, Susan E. Thompson, Jason F. Rowe, Christopher J. Burke, David W. Latham, Natalie M. Batalha, Aviv Ofir, Billy L. Quarles, Christopher E. Henze, Angie Wolfgang, Douglas A. Caldwell, Stephen T. Bryson, Avi Shporer, Joseph Catanzarite, Rachel Akeson, Thomas Barclay, William J. Borucki, Tabetha S. Boyajian, Jennifer R. Campbell, Jessie L. Christiansen, Forrest R. Girouard, Michael R. Haas, Steve B. Howell, Daniel Huber, Jon M. Jenkins, Jie Li, Anima Patil-Sabale, Elisa V. Quintana, Solange Ramirez, Shawn Seader, Jeffrey C. Smith, Peter Tenenbaum
Faculty Publications
We present the seventh Kepler planet candidate (PC) catalog, which is the first catalog to be based on the entire, uniformly processed 48-month Kepler data set. This is the first fully automated catalog, employing robotic vetting procedures to uniformly evaluate every periodic signal detected by the Q1-Q17 Data Release 24 (DR24) Kepler pipeline. While we prioritize uniform vetting over the absolute correctness of individual objects, we find that our robotic vetting is overall comparable to, and in most cases superior to, the human vetting procedures employed by past catalogs. This catalog is the first to utilize artificial transit injection to …
Evidence For Reflected Light From The Most Eccentric Exoplanet Known, Stephen R. Kane, Robert A. Wittenmyer, Natalie R. Hinkel, Arpita Roy, Suvrath Mahadevan, Diana Dragomir, Jaymie M. Matthews, Gregory W. Henry, Abhijit Chakraborty, Tabetha S. Boyajian, Jason T. Wright, David R. Ciardi, Debra A. Fischer, R. Paul Butler, C. G. Tinney, Brad D. Carter, Hugh R.A. Jones, Jeremy Bailey, Simon J. O'Toole
Evidence For Reflected Light From The Most Eccentric Exoplanet Known, Stephen R. Kane, Robert A. Wittenmyer, Natalie R. Hinkel, Arpita Roy, Suvrath Mahadevan, Diana Dragomir, Jaymie M. Matthews, Gregory W. Henry, Abhijit Chakraborty, Tabetha S. Boyajian, Jason T. Wright, David R. Ciardi, Debra A. Fischer, R. Paul Butler, C. G. Tinney, Brad D. Carter, Hugh R.A. Jones, Jeremy Bailey, Simon J. O'Toole
Faculty Publications
Planets in highly eccentric orbits form a class of objects not seen within our solar system. The most extreme case known among these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitoring Survey. We obtained CHIRON spectra to perform an independent estimation of the fundamental stellar parameters. New radial velocities from Anglo-Australian Telescope and PARAS observations during periastron passage greatly improve our knowledge of the eccentric nature of the orbit. The …
Stellar Activity And Exclusion Of The Outer Planet In The Hd 99492 System, Stephen R. Kane, Badrinath Thirumalachari, Gregory W. Henry, Natalie R. Hinkel, Eric L.N. Jensen, Tabetha S. Boyajian, Debra A. Fischer, Andrew W. Howard, Howard T. Isaacson, Jason T. Wright
Stellar Activity And Exclusion Of The Outer Planet In The Hd 99492 System, Stephen R. Kane, Badrinath Thirumalachari, Gregory W. Henry, Natalie R. Hinkel, Eric L.N. Jensen, Tabetha S. Boyajian, Debra A. Fischer, Andrew W. Howard, Howard T. Isaacson, Jason T. Wright
Faculty Publications
A historical problem for indirect exoplanet detection has been contending with the intrinsic variability of the host star. If the variability is periodic, it can easily mimic various exoplanet signatures, such as radial velocity (RV) variations that originate with the stellar surface rather than the presence of a planet. Here we present an update for the HD 99492 planetary system, using new RV and photometric measurements from the Transit Ephemeris Refinement and Monitoring Survey. Our extended time series and subsequent analyses of the Ca ii H&K emission lines show that the host star has an activity cycle of ∼13 years. …
High-Precision Photometry By Telescope Defocussing - Viii.Wasp-22, Wasp-41,Wasp-42 Andwasp-55, John Southworth, J. Tregloan-Reed, M. I. Andersen, S. Calchi Novati, S. Ciceri, J. P. Colque, G. D'Ago, M. Dominik, D. F. Evans, S. H. Gu, A. Herrera-Cordova, T. C. Hinse, U. G. Jørgensen, D. Juncher, M. Kuffmeier, L. Mancini, N. Peixinho, A. Popovas, M. Rabus, J. Skottfelt, R. Tronsgaard, E. Unda-Sanzana, X. B. Wang, O. Wertz, K. A. Alsubai, J. M. Andersen, V. Bozza, D. M. Bramich, M. Burgdorf, Y. Damerdji, C. Diehl, A. Elyiv, R. Figuera Jaimes
High-Precision Photometry By Telescope Defocussing - Viii.Wasp-22, Wasp-41,Wasp-42 Andwasp-55, John Southworth, J. Tregloan-Reed, M. I. Andersen, S. Calchi Novati, S. Ciceri, J. P. Colque, G. D'Ago, M. Dominik, D. F. Evans, S. H. Gu, A. Herrera-Cordova, T. C. Hinse, U. G. Jørgensen, D. Juncher, M. Kuffmeier, L. Mancini, N. Peixinho, A. Popovas, M. Rabus, J. Skottfelt, R. Tronsgaard, E. Unda-Sanzana, X. B. Wang, O. Wertz, K. A. Alsubai, J. M. Andersen, V. Bozza, D. M. Bramich, M. Burgdorf, Y. Damerdji, C. Diehl, A. Elyiv, R. Figuera Jaimes
Faculty Publications
We present 13 high-precision and four additional light curves of four bright southernhemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 and WASP-55. In the cases of WASP-42 and WASP-55, these are the first follow-up observations since their discovery papers. We present refined measurements of the physical properties and orbital ephemerides of all four systems. No indications of transit timing variations were seen. All four planets have radii inflated above those expected from theoretical models of gas-giant planets; WASP-55 b is the most discrepant with a mass of 0.63MJup and a radius of 1.34 RJup. WASP-41 shows brightness anomalies during transit due …