Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Planetary systems (7)
- Techniques: photometric (6)
- Celestial mechanics (5)
- Planetary systems: formation (3)
- Planetary systems: protoplanetary disks (3)
-
- Astrobiology (2)
- Eclipses (2)
- Infrared: planetary systems (2)
- Planets and satellites: atmospheres (2)
- Planets and satellites: fundamental parameters (2)
- Aerodynamics (1)
- Atmosphere-land interaction (1)
- Automatic weather stations (1)
- Brown dwarfs (1)
- Circumstellar matter (1)
- Convection (1)
- Drag reduction (1)
- Dust or dust storms (1)
- Extrasolar terrestrial planets (1)
- Extreme events (1)
- Field experiments (1)
- Flood events (1)
- Freeze events (1)
- Friction (1)
- Gl 581 (1)
- Globular clusters: individual (47 Tuc) (1)
- HD 75732) (1)
- Habitable zones (1)
- Ice (1)
- Ice sheets (1)
Articles 1 - 25 of 25
Full-Text Articles in Entire DC Network
A Survey For Very Short-Period Planets In The Kepler Data, Brian Jackson, Christopher C. Stark, Elisabeth R. Adams, John Chambers, Drake Deming
A Survey For Very Short-Period Planets In The Kepler Data, Brian Jackson, Christopher C. Stark, Elisabeth R. Adams, John Chambers, Drake Deming
Brian Jackson
We conducted a search for very short-period transiting objects in the publicly available Kepler data set. Our preliminary survey has revealed four planetary candidates, all with orbital periods less than 12 hr. We have analyzed the data for these candidates using photometric models that include transit light curves, ellipsoidal variations, and secondary eclipses to constrain the candidates’ radii, masses, and effective temperatures. Even with masses of only a few Earth masses, the candidates’ short periods mean that they may induce stellar radial velocity signals (a few m s−1) detectable by currently operating facilities. The origins of such short-period planets are …
Measurement Of Spin-Orbit Misalignment And Nodal Precession For The Planet Around Pre-Main-Sequence Star Ptfo 8-8695 From Gravity Darkening, Jason W. Barnes, Julian C. Van Eyken, Brian K. Jackson, David R. Ciardi, Jonathan J. Fortney
Measurement Of Spin-Orbit Misalignment And Nodal Precession For The Planet Around Pre-Main-Sequence Star Ptfo 8-8695 From Gravity Darkening, Jason W. Barnes, Julian C. Van Eyken, Brian K. Jackson, David R. Ciardi, Jonathan J. Fortney
Brian Jackson
PTFO 8-8695b represents the first transiting exoplanet candidate orbiting a pre-main-sequence star (van Eyken et al. 2012, ApJ, 755, 42). We find that the unusual lightcurve shapes of PTFO 8-8695 can be explained by transits of a planet across an oblate, gravity-darkened stellar disk. We develop a theoretical framework for understanding precession of a planetary orbit’s ascending node for the case when the stellar rotational angular momentum and the planetary orbital angular momentum are comparable in magnitude. We then implement those ideas to simultaneously and self-consistently fit two separate lightcurves observed in 2009 December and 2010 December. Our two self-consistent …
A Search For Exozodiacal Clouds With Kepler, Christopher C. Stark, Alan P. Boss, Alycia J. Weinberger, Brian K. Jackson, Michael Endl, William D. Cochran, Marshall Johnson, Caroline Caldwell, Eric Agol, Eric B. Ford, Jennifer R. Hall, Khadeejah A. Ibrahim, Jie Li
A Search For Exozodiacal Clouds With Kepler, Christopher C. Stark, Alan P. Boss, Alycia J. Weinberger, Brian K. Jackson, Michael Endl, William D. Cochran, Marshall Johnson, Caroline Caldwell, Eric Agol, Eric B. Ford, Jennifer R. Hall, Khadeejah A. Ibrahim, Jie Li
Brian Jackson
Planets embedded within dust disks may drive the formation of large scale clumpy dust structures by trapping dust into resonant orbits. Detection and subsequent modeling of the dust structures would help constrain the mass and orbit of the planet and the disk architecture, give clues to the history of the planetary system, and provide a statistical estimate of disk asymmetry for future exoEarth-imaging missions. Here, we present the first search for these resonant structures in the inner regions of planetary systems by analyzing the light curves of hot Jupiter planetary candidates identified by the Kepler mission. We detect only one …
Infrared Eclipses Of The Strongly Irradiated Planet Wasp-33b, And Oscillations Of Its Host Star, Drake Deming, Jonathan D. Fraine, Pedro V. Sada, Nikku Madhusudhan, Heather A. Knutson, Joseph Harrington, Jasmina Blecic, Sarah Nymeyer, Alexis M.S. Smith, Brian Jackson
Infrared Eclipses Of The Strongly Irradiated Planet Wasp-33b, And Oscillations Of Its Host Star, Drake Deming, Jonathan D. Fraine, Pedro V. Sada, Nikku Madhusudhan, Heather A. Knutson, Joseph Harrington, Jasmina Blecic, Sarah Nymeyer, Alexis M.S. Smith, Brian Jackson
Brian Jackson
We observe two secondary eclipses of the strongly irradiated transiting planet WASP-33b, in the Ks band at 2.15 μm, and one secondary eclipse each at 3.6 μm and 4.5 μm using Warm Spitzer. This planet orbits an A5V δ-Scuti star that is known to exhibit low-amplitude non-radial p-mode oscillations at about 0.1% semi-amplitude. We detect stellar oscillations in all of our infrared eclipse data, and also in one night of observations at J band (1.25 μm) out of eclipse. The oscillation amplitude, in all infrared bands except Ks, is about the same as in the optical. However, the stellar oscillations …
The Evil-Mc Model For Ellipsoidal Variations Of Planet-Hosting Stars And Applications To The Hat-P-7 System, Brian K. Jackson, Nikole K. Lewis, Jason W. Barnes, L. Drake Deming, Adam P. Showman, Jonathan J. Fortney
The Evil-Mc Model For Ellipsoidal Variations Of Planet-Hosting Stars And Applications To The Hat-P-7 System, Brian K. Jackson, Nikole K. Lewis, Jason W. Barnes, L. Drake Deming, Adam P. Showman, Jonathan J. Fortney
Brian Jackson
We present a new model for Ellipsoidal Variations Induced by a Low-Mass Companion, the EVIL-MC model. We employ several approximations appropriate for planetary systems to substantially increase the computational efficiency of our model relative to more general ellipsoidal variation models and improve upon the accuracy of simpler models. This new approach gives us a unique ability to rapidly and accurately determine planetary system parameters. We use the EVIL-MC model to analyze Kepler Quarter 0-2 (Q0-2) observations of the HAT-P-7 system, an F-type star orbited by a ~ Jupiter-mass companion. Our analysis corroborates previous estimates of the planet-star mass ratio q …
Constraining Tidal Dissipation In Stars From The Destruction Rates Of Exoplanets, Kaloyan Penev, Brian Jackson, Federico Spada, Nicole Thom
Constraining Tidal Dissipation In Stars From The Destruction Rates Of Exoplanets, Kaloyan Penev, Brian Jackson, Federico Spada, Nicole Thom
Brian Jackson
We use the distribution of extrasolar planets in circular orbits around stars with surface convective zones detected by ground-based transit searches to constrain how efficiently tides raised by the planet are dissipated on the parent star. We parameterize this efficiency as a tidal quality factor (Q*). We conclude that the population of currently known planets is inconsistent with Q* < 107 at the 99% level. Previous studies show that values of Q* between 105 and 107 are required in order to explain the orbital circularization of main-sequence low-mass binary stars in clusters, suggesting that different dissipation mechanisms might be acting in the two cases, most likely due to the very different tidal forcing frequencies relative to the stellar rotation frequency occurring for star-star versus planet-star systems.
Detection Of Thermal Emission From A Super-Earth, Brice-Olivier Demory, Michaël Gillon, Sara Seager, Bjoern Benneke, Drake Deming, Brian Jackson
Detection Of Thermal Emission From A Super-Earth, Brice-Olivier Demory, Michaël Gillon, Sara Seager, Bjoern Benneke, Drake Deming, Brian Jackson
Brian Jackson
We report on the detection of infrared light from the super-Earth 55 Cnc e, based on four occultations obtained with Warm Spitzer at 4.5 μm. Our data analysis consists of a two-part process. In a first step, we perform individual analyses of each data set and compare several baseline models to optimally account for the systematics affecting each light curve. We apply independent photometric correction techniques, including polynomial detrending and pixel mapping, that yield consistent results at the 1σ level. In a second step, we perform a global Markov Chain Monte Carlo analysis, including all four data sets that yield …
Extrasolar Planet Transits Observed At Kitt Peak National Observatory, Pedro V. Sada, Drake Deming, Donald E. Jennings, Brian K. Jackson, Catrina M. Hamilton, Jonathan Fraine, Steven W. Peterson, Flynn Haase, Kevin Bays, Allen Lunsford, Eamon O'Gorman
Extrasolar Planet Transits Observed At Kitt Peak National Observatory, Pedro V. Sada, Drake Deming, Donald E. Jennings, Brian K. Jackson, Catrina M. Hamilton, Jonathan Fraine, Steven W. Peterson, Flynn Haase, Kevin Bays, Allen Lunsford, Eamon O'Gorman
Brian Jackson
We obtained J-, H-, and JH-band photometry of known extrasolar planet transiting systems at the 2.1 m Kitt Peak National Observatory Telescope using the FLAMINGOS infrared camera between 2008 October and 2011 October. From the derived light curves we have extracted the midtransit times, transit depths and transit durations for these events. The precise midtransit times obtained help improve the orbital periods and also constrain transit-time variations of the systems. For most cases the published system parameters successfully accounted for our observed light curves, but in some instances we derive improved planetary radii and orbital periods. We complemented our 2.1 …
Meteorological Conditions At Racetrack Playa, Death Valley National Park: Implications For Rock Production And Transport, Ralph D. Lorenz, Brian K. Jackson, Jason W. Barnes, Joseph N. Spitale, Jani Radebaugh, Kevin H. Baines
Meteorological Conditions At Racetrack Playa, Death Valley National Park: Implications For Rock Production And Transport, Ralph D. Lorenz, Brian K. Jackson, Jason W. Barnes, Joseph N. Spitale, Jani Radebaugh, Kevin H. Baines
Brian Jackson
Three decades of weather records at meteorological stations near Death Valley National Park are analyzed in an attempt to gauge the frequency of conditions that might form and erase the famous trails of wind-blown rocks in the mud of Racetrack Playa. Trail formation requires the playa to be wet, followed by strong winds and/or freezing conditions. Weather records are compared with a limited set of meteorological data that were acquired in situ at the playa over three winters and that indicate freezing on 50, 29, and 15 nights during the winters of 2007/08–09/10, respectively, as well as with the hydrological …
Kepler And Ground-Based Transits Of The Exo-Neptune Hat-P-11b, Drake Deming, Pedro V. Sada, Brian Jackson, Steven W. Peterson, Eric Agol, Heather A. Knutson, Donald E. Jennings, Flynn Haase, Kevin Bays
Kepler And Ground-Based Transits Of The Exo-Neptune Hat-P-11b, Drake Deming, Pedro V. Sada, Brian Jackson, Steven W. Peterson, Eric Agol, Heather A. Knutson, Donald E. Jennings, Flynn Haase, Kevin Bays
Brian Jackson
We analyze 26 archival Kepler transits of the exo-Neptune HAT-P-11b, supplemented by ground-based transits observed in the blue (B band) and near-IR (J band). Both the planet and host star are smaller than previously believed; our analysis yields Rp = 4.31 R⊕ ± 0.06 R ⊕ and Rs = 0.683 R☉ ± 0.009 R☉, both about 3σ smaller than the discovery values. Our ground-based transit data at wavelengths bracketing the Kepler bandpass serve to check the wavelength dependence of stellar limb darkening, and the J-band transit provides a precise and independent constraint on the transit duration. Both the limb darkening …
Ice Rafts Not Sails: Floating The Rocks At Racetrack Playa, Ralph D. Lorenz, Brian K. Jackson, Jason W. Barnes, Joe Spitale, John M. Keller
Ice Rafts Not Sails: Floating The Rocks At Racetrack Playa, Ralph D. Lorenz, Brian K. Jackson, Jason W. Barnes, Joe Spitale, John M. Keller
Brian Jackson
We suggest that the existence of many of the rock-carved trails at Racetrack Playa in Death Valley National Park is predominantly due to the effect of arbitrarily weak winds on rocks that are floated off the soft bed by small rafts of ice, as also occurs in arctic tidal beaches to form boulder barricades. These ice cakes need not have a particularly large surface area if the ice is adequately thick—the ice cakes allow the rocks to move by buoyantly reducing the reaction and friction forces at the bed, not by increasing the wind drag. The parameter space of ice …
Too Little, Too Late: How The Tidal Evolution Of Hot Jupiters Affects Transit Surveys Of Clusters, John H. Debes, Brian Jackson
Too Little, Too Late: How The Tidal Evolution Of Hot Jupiters Affects Transit Surveys Of Clusters, John H. Debes, Brian Jackson
Brian Jackson
The tidal evolution of hot Jupiters may change the efficiency of transit surveys of stellar clusters. The orbital decay that hot Jupiters suffer may result in their destruction, leaving fewer transiting planets in older clusters. We calculate the impact tidal evolution has for different assumed stellar populations, including that of 47 Tuc, a globular cluster that was the focus of an intense Hubble Space Telescope search for transits. We find that in older clusters, one expects to detect fewer transiting planets by a factor of 2 for surveys sensitive to Jupiter-like planets in orbits out to 0.5 AU, and up …
The Roles Of Tidal Evolution And Evaporative Mass Loss In The Origin Of Corot-7 B, Brian Jackson, Neil Miller, Rory Barnes, Sean N. Raymond, Jonathan J. Fortney, Richard Greenberg
The Roles Of Tidal Evolution And Evaporative Mass Loss In The Origin Of Corot-7 B, Brian Jackson, Neil Miller, Rory Barnes, Sean N. Raymond, Jonathan J. Fortney, Richard Greenberg
Brian Jackson
CoRoT-7 b is the first confirmed rocky exoplanet, but, with an orbital semimajor axis of 0.0172 au, its origins may be unlike any rocky planet in our Solar system. In this study, we consider the roles of tidal evolution and evaporative mass loss in CoRoT-7 b's history, which together have modified the planet's mass and orbit. If CoRoT-7 b has always been a rocky body, evaporation may have driven off almost half its original mass, but the mass loss may depend sensitively on the extent of tidal decay of its orbit. As tides caused CoRoT-7 b's orbit to decay, they …
Recent Transits Of The Super-Earth Exoplanet Gj 1214b, Pedro V. Sada, Drake Deming, Brian Jackson, Donald E. Jennings, Steven W. Peterson, Flynn Haase, Kevin Bays, Eamon O'Gorman, Alan Lundsford
Recent Transits Of The Super-Earth Exoplanet Gj 1214b, Pedro V. Sada, Drake Deming, Brian Jackson, Donald E. Jennings, Steven W. Peterson, Flynn Haase, Kevin Bays, Eamon O'Gorman, Alan Lundsford
Brian Jackson
We report recent ground-based photometry of the transiting super-Earth exoplanet GJ 1214b at several wavelengths, including the infrared near 1.25 μm (J band). We observed a J-band transit with the FLAMINGOS infrared imager and the 2.1 m telescope on Kitt Peak, and we observed several optical transits using a 0.5 m telescope on Kitt Peak and the 0.36 m Universidad de Monterrey Observatory telescope. Our high-precision J-band observations exploit the brightness of the M dwarf host star at this infrared wavelength as compared with the optical and are significantly less affected by stellar activity and limb darkening. We fit the …
Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib
Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib
Brian Jackson
CoRoT-7b, a planet about 70% larger than the Earth orbiting a Sun-like star, is the first-discovered rocky exoplanet, and hence has been dubbed a "super-Earth." Some initial studies suggested that since the planet is so close to its host star, it receives enough insolation to partially melt its surface. However, these past studies failed to take into consideration the role that tides may play in this system. Even if the planet's eccentricity has always been zero, we show that tidal decay of the semimajor axis could have been large enough that the planet formed on a wider orbit which received …
Inexpensive Time-Lapse Digital Cameras For Studying Transient Meteorological Phenomena: Dust Devils And Playa Flooding, Ralph D. Lorenz, Brian Jackson, Jason W. Barnes
Inexpensive Time-Lapse Digital Cameras For Studying Transient Meteorological Phenomena: Dust Devils And Playa Flooding, Ralph D. Lorenz, Brian Jackson, Jason W. Barnes
Brian Jackson
The authors describe the design and performance of inexpensive and compact time-lapse cameras suitable for field deployment in remote locations for long periods and their application to studying two time-variable meteorological phenomena in arid regions: desert dust devils and transient flooding of playa lakes. The camera units (with a total parts cost of ∼$80) are based around commercial “point and shoot” digital cameras, storing ∼1500 images on a solid-state memory card over a period between an hour to several months powered by alkaline batteries. A microcontroller can trigger image acquisition based on sensor inputs or at regular intervals. Some example …
Tidal Limits To Planetary Habitability, Rory Barnes, Brian Jackson, Richard Greenberg, Sean N. Raymond
Tidal Limits To Planetary Habitability, Rory Barnes, Brian Jackson, Richard Greenberg, Sean N. Raymond
Brian Jackson
The habitable zones (HZs) of main-sequence stars have traditionally been defined as the range of orbits that intercept the appropriate amount of stellar flux to permit surface water on a planet. Terrestrial exoplanets discovered to orbit M stars in these zones, which are close-in due to decreased stellar luminosity, may also undergo significant tidal heating. Tidal heating may span a wide range for terrestrial exoplanets and may significantly affect conditions near the surface. For example, if heating rates on an exoplanet are near or greater than that on Io (where tides drive volcanism that resurfaces the planet at least every …
Observational Evidence For Tidal Destruction Of Exoplanets, Brian Jackson, Rory Barnes, Richard Greenberg
Observational Evidence For Tidal Destruction Of Exoplanets, Brian Jackson, Rory Barnes, Richard Greenberg
Brian Jackson
The distribution of the orbits of close-in exoplanets shows evidence for ongoing removal and destruction by tides. Tides raised on a planet's host star cause the planet's orbit to decay, even after the orbital eccentricity has dropped to zero. Comparison of the observed orbital distribution and predictions of tidal theory shows good qualitative agreement, suggesting tidal destruction of close-in exoplanets is common. The process can explain the observed cutoff in small semimajor axis values, the clustering of orbital periods near three days, and the relative youth of transiting planets. Contrary to previous considerations, a mechanism to stop the inward migration …
Shoreline Features Of Titan’S Ontario Lacus From Cassini/Vims Observations, Jason W. Barnes, Robert H. Brown, Jason M. Soderblom, Laurence A. Soderblom, Ralf Jaumann, Brian Jackson, Christophe Sotin, Bonnie J. Buratti, Karly M. Pitman, Kevin H. Baines, Roger N. Clark, Phillip D. Nicholson, Elizabeth P. Turtle, Jason Perry
Shoreline Features Of Titan’S Ontario Lacus From Cassini/Vims Observations, Jason W. Barnes, Robert H. Brown, Jason M. Soderblom, Laurence A. Soderblom, Ralf Jaumann, Brian Jackson, Christophe Sotin, Bonnie J. Buratti, Karly M. Pitman, Kevin H. Baines, Roger N. Clark, Phillip D. Nicholson, Elizabeth P. Turtle, Jason Perry
Brian Jackson
We analyze observations of Titan's south polar lake Ontario Lacus obtained by Cassini's Visual and Infrared Mapping Spectrometer during the 38th flyby of Titan (T38; 2007 December 5). These near-closest-approach observations have the highest signal-to-noise, the finest spatial resolution, and the least atmospheric influence of any near-infrared lake observation to date. We use the large, spatially flat, and low-albedo interior of Ontario Lacus as a calibration target allowing us to derive an analytical atmospheric correction for emission angle. The dark lake interior is surrounded by two separate annuli that follow the lake interior's contours. The inner annulus is uniformly dark, …
The Hd 40307 Planetary System: Super-Earths Or Mini-Neptunes?, Rory Barnes, Brian Jackson, Sean N. Raymond, Andrew A. West, Richard Greenberg
The Hd 40307 Planetary System: Super-Earths Or Mini-Neptunes?, Rory Barnes, Brian Jackson, Sean N. Raymond, Andrew A. West, Richard Greenberg
Brian Jackson
Three planets with minimum masses less than 10 M⊕ orbit the star HD 40307, suggesting these planets may be rocky. However, with only radial velocity data, it is impossible to determine if these planets are rocky or gaseous. Here we exploit various dynamical features of the system in order to assess the physical properties of the planets. Observations allow for circular orbits, but a numerical integration shows that the eccentricities must be at least 10–4. Also, planets b and c are so close to the star that tidal effects are significant. If planet b has tidal parameters similar to the …
Tidal Heating Of Terrestrial Extrasolar Planets And Implications For Their Habitability, Brian Jackson, Rory Barnes, Richard Greenberg
Tidal Heating Of Terrestrial Extrasolar Planets And Implications For Their Habitability, Brian Jackson, Rory Barnes, Richard Greenberg
Brian Jackson
The tidal heating of hypothetical rocky (or terrestrial) extrasolar planets spans a wide range of values depending on stellar masses and initial orbits. Tidal heating may be sufficiently large (in many cases, in excess of radiogenic heating) and long-lived to drive plate tectonics, similar to the Earth's, which may enhance the planet's habitability. In other cases, excessive tidal heating may result in Io-like planets with violent volcanism, probably rendering them unsuitable for life. On water-rich planets, tidal heating may generate subsurface oceans analogous to Europa's with similar prospects for habitability. Tidal heating may enhance the outgassing of volatiles, contributing to …
Tidal Heating Of Extrasolar Planets, Brian Jackson, Richard Greenberg, Rory Barnes
Tidal Heating Of Extrasolar Planets, Brian Jackson, Richard Greenberg, Rory Barnes
Brian Jackson
Extrasolar planets close to their host stars have likely undergone significant tidal evolution since the time of their formation. Tides probably dominated their orbital evolution once the dust and gas cleared away, and as the orbits evolved there was substantial tidal heating within the planets. The tidal heating history of each planet may have contributed significantly to the thermal budget governing the planet's physical properties, including its radius, which in many cases may be measured by observing transit events. Typically, tidal heating increases as a planet moves inward toward its star and then decreases as its orbit circularizes. Here we …
Tides And The Evolution Of Planetary Habitability, Rory Barnes, Sean N. Raymond, Brian Jackson, Richard Greenberg
Tides And The Evolution Of Planetary Habitability, Rory Barnes, Sean N. Raymond, Brian Jackson, Richard Greenberg
Brian Jackson
Tides raised on a planet by the gravity of its host star can reduce the planet's orbital semi-major axis and eccentricity. This effect is only relevant for planets orbiting very close to their host stars. The habitable zones of low-mass stars are also close in, and tides can alter the orbits of planets in these locations. We calculate the tidal evolution of hypothetical terrestrial planets around low-mass stars and show that tides can evolve planets past the inner edge of the habitable zone, sometimes in less than 1 billion years. This migration requires large eccentricities (>0.5) and low-mass stars …
Tidal Evolution Of Close-In Extrasolar Planets, Brian Jackson, Richard Greenberg, Rory Barnes
Tidal Evolution Of Close-In Extrasolar Planets, Brian Jackson, Richard Greenberg, Rory Barnes
Brian Jackson
The distribution of eccentricities e of extrasolar planets with semimajor axes a > 0.2 AU is very uniform, and values for e are relatively large, averaging 0.3 and broadly distributed up to near 1. For a < 0.2 AU, eccentricities are much smaller (most e < 0.2), a characteristic widely attributed to damping by tides after the planets formed and the protoplanetary gas disk dissipated. Most previous estimates of the tidal damping considered the tides raised on the planets, but ignored the tides raised on the stars. Most also assumed specific values for the planets' poorly constrained tidal dissipation parameter Qp. Perhaps most important, in many studies the strongly coupled evolution between e and a was ignored. We have now integrated the coupled tidal evolution equations for e and a over the estimated age of each planet, and confirmed that the distribution of initial e values of close-in planets matches that of the general population for reasonable Q values, with the best fits for stellar and planetary Q being ~105.5 and ~106.5, respectively. The accompanying evolution of a values shows most close-in planets had significantly larger a at the start of tidal migration. The earlier gas disk migration did not bring all planets to their current orbits. The current small values of a were only reached gradually due to tides over the lifetimes of the planets. These results may have important implications for planet formation models, atmospheric models of "hot Jupiters," and the success of transit surveys.
An Internet Database Of Ultraviolet Continuum Light Curves For Seyfert Galaxies, Jay P. Dunn, Brian Jackson, Rajesh P. Deo, Chris Farrington, Varendra Das, D. Michael Crenshaw
An Internet Database Of Ultraviolet Continuum Light Curves For Seyfert Galaxies, Jay P. Dunn, Brian Jackson, Rajesh P. Deo, Chris Farrington, Varendra Das, D. Michael Crenshaw
Brian Jackson
Using the Multimission Archive at STScI (MAST), we have extracted spectra and determined continuum light curves for 175 Seyfert galaxies that have been observed with the International Ultraviolet Explorer and the Faint Object Spectrograph on the Hubble Space Telescope. To obtain the light curves as a function of Julian Date, we used fixed bins in the object’s rest frame and measured small regions (between 30 and 60 Å) of each spectrum’s continuum flux in the range 1150 to 3200 Å. We provide access to the UV light curves and other basic information about the observations in tabular and graphical form …