A5015975329- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Astrophysical Phenomena and Observations
- Fluid Dynamics and Turbulent Flows
- demographic modeling and climate adaptation
- Methane Hydrates and Related Phenomena
- Meteorological Phenomena and Simulations
- Reservoir Engineering and Simulation Methods
- CCD and CMOS Imaging Sensors
- Underwater Vehicles and Communication Systems
- Plant biochemistry and biosynthesis
- Advanced Computational Techniques and Applications
- Magnetic confinement fusion research
- Microwave Imaging and Scattering Analysis
The University of Texas at Dallas
2017-2023
Laboratoire d’Astrophysique de Marseille
2021
Princeton University
2012-2018
Princeton Public Schools
2015
Center for Astrophysics Harvard & Smithsonian
2007-2014
Harvard University
2004-2011
Harvard University Press
2004
California Institute of Technology
2004
HATSouth is the world's first network of automated and homogeneous telescopes that capable year-round 24-hour monitoring positions over an entire hemisphere sky. The primary scientific goal to discover characterize a large number transiting extrasolar planets, reaching out long periods down small planetary radii. achieves this by extended areas on sky, deriving high precision light curves for stars, searching signature transits, confirming candidates with larger telescopes. employs 6...
We report the discovery of three new transiting extrasolar planets orbiting moderately bright (V = 11.1, 11.7, and 12.4) F stars. The HAT-P-39b through HAT-P-41b have periods P 3.5439 days, 4.4572 2.6940 masses 0.60 MJ, 0.62 0.80 radii 1.57 RJ, 1.73 1.68 respectively. They orbit stars with 1.40 M☉, 1.51 are members an emerging population highly inflated Jupiters 0.4 MJ < M 1.5 R > RJ.
Wide field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between properties and their parent stars. We report discovery HAT-P-69b (TOI 625.01) HAT-P-70b 624.01), two new hot Jupiters around A stars from HATNet survey which have also been observed by Transiting Exoplanet Survey Satellite (TESS). has mass 3.58 +0.58/-0.58 MJup radius 1.676 +0.051/-0.033 RJup, residing in prograde 4.79-day orbit. 1.87...
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 planet are dissipated on parent star. parameterize this efficiency as a tidal quality factor (Q*). conclude that population currently known is inconsistent Q*<10^7 at 99% level. Previous studies show values Q* between 10^5 and 10^7 required order explain orbital circularization main sequence low mass...
We report the discovery by HATSouth survey of HATS-4b, an extrasolar planet transiting a V = 13.46 mag G star. HATS-4b has period P ≈ 2.5167 days, mass Mp 1.32 MJup, radius Rp 1.02 RJup, and density ρp 1.55 ± 0.16 g cm−3 ≈1.24 ρJup. The host star 1.00 M☉, 0.92 R☉, very high metallicity [Fe/H]=0.43 0.08. is among densest known planets with masses between 1 2 MJ thus likely to have significant content heavy elements order 75 M⊕. In this paper we present data reduction, radial velocity...
We report the discovery of HATS-1b, a transiting extrasolar planet orbiting moderately bright V=12.05 G dwarf star GSC 6652-00186, and first discovered by HATSouth, global network autonomous wide-field telescopes. HATS-1b has period P~3.4465 d, mass Mp~1.86MJ, radius Rp~1.30RJ. The host 0.99Msun, 1.04Rsun. light curve near continuous coverage over several multi-day periods, demonstrating power using telescopes to discover planets.
We report the discovery by HATSouth survey of HATS-3b, a transiting extrasolar planet orbiting V = 12.4 F dwarf star. HATS-3b has period P 3.5479 days, mass Mp 1.07 MJ, and radius Rp 1.38 RJ. Given planet, brightness host star, stellar rotational velocity (vsin i 9.0 km s−1), this system will make an interesting target for future observations to measure Rossiter–McLaughlin effect determine its spin–orbit alignment. detail low-/medium-resolution reconnaissance spectroscopy that we are now...
Abstract We announce the discovery of KELT-16b, a highly irradiated, ultra-short period hot Jupiter transiting relatively bright ( V = 11.7) star TYC 2688-1839-1/KELT-16. A global analysis system shows KELT-16 to be an F7V with <?CDATA ${T}_{\mathrm{eff}}=6236\pm 54$?> K, $\mathrm{log}{g}_{\star }={4.253}_{-0.036}^{+0.031}$?> , $[\mathrm{Fe}/{\rm{H}}]=-{0.002}_{-0.085}^{+0.086}$?> ${M}_{\star }={1.211}_{-0.046}^{+0.043}\,{M}_{\odot }$?> and ${R}_{\star }\,={1.360}_{-0.053}^{+0.064}{R}_{\odot...
We report the discovery of HATS-17b, first transiting warm Jupiter HATSouth network. HATS-17b transits its bright (V=12.4) G-type (M$_{\star}$=1.131 $\pm$ 0.030 M$_{\odot}$, R$_{\star}$=1.091$^{+0.070}_{-0.046}$ R$_{\star}$) metal-rich ([Fe/H]=+0.3 dex) host star in a circular orbit with period P=16.2546 days. has very compact radius 0.777 0.056 R$_J$ given Jupiter-like mass 1.338 0.065 M$_J$. Up to 50% may be composed heavy elements order explain high density current models planetary...
We present the discovery of KELT-21b, a hot Jupiter transiting $V=10.5$ A8V star HD 332124. The planet has an orbital period $P=3.6127647\pm0.0000033$ days and radius $1.586_{-0.040}^{+0.039}$ $R_J$. set upper limit on planetary mass $M_P<3.91$ $M_J$ at $3\sigma$ confidence. confirmed nature companion using this Doppler tomographic observations to verify that transits These data also demonstrate orbit is well-aligned with stellar spin, sky-projected spin-orbit misalignment...
Abstract The relative rarity of giant planets around low-mass stars compared with solar-type is a key prediction from the core-accretion planet formation theory. In this paper we report on discovery four gas that transit late K and early M dwarfs. HATS-74Ab (TOI 737b), HATS-75b 552b), HATS-76b 555b), HATS-77b 730b) were all discovered HATSouth photometric survey follow-up using TESS other facilities. We use new ESPRESSO facility at VLT to confirm systems measure their masses. find these have...
The development of 2D and 3D simulations solar convection has lead to a picture quite unlike the usually assumed Kolmogorov spectrum turbulent flow. We investigate impact this changed structure on dissipation properties zone, parametrized by an effective viscosity coefficient. use expansion treatment developed Goodman & Oh 1997, applied numerical model (Robinson et al. 2003) calculate as function frequency compare currently existing prescriptions based assumption turbulence (Zahn 1966,...
We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with mass 1.477 (-0.067, +0.066) M_J, and radius 1.345 +/- 0.072 R_J, an orbital period 2.7033904 0.000010 days. The host star, KELT-3, is V=9.8 late F star M_* = 1.278 (-0.061, +0.063) M_sun, R_* 1.472 +0.065) R_sun, T_eff 6306 (-49, +50) K, log(g) 4.209 (-0.031, +0.033), [Fe/H] 0.044 (-0.082, +0.080), has likely proper motion companion. KELT-3b third exoplanet discovered by KELT survey, orbiting one 20...
We report the discovery of four transiting F-M binary systems with companions between 0.1 and 0.2 M⊙ in mass by HATSouth survey. These have been characterized via a global analysis data, combined high-resolution radial velocities accurate transit photometry observations. determined masses radii component stars using combination two methods: isochrone fitting spectroscopic primary star parameters equating rotation velocity spin–orbit synchronization. new very low are HATS550-016B...
We report the discovery by HATSouth survey of HATS-6b, an extrasolar planet transiting a V = 15.2 mag, i 13.7 mag M1V star with mass 0.57 and radius . HATS-6b has period P 3.3253 d, 0.32 , 1.00 zero-albedo equilibrium temperature 712.8 ± 5.1 K. HATS-6 is one lowest stars known to host close-in gas giant planet, its transits are among deepest any system. discuss follow-up opportunities afforded this system, noting that despite faintness star, it expected have highest K-band S/N transmission...
We report the discovery of KELT-6b, a mildly-inflated Saturn-mass planet transiting metal-poor host. The initial transit signal was identified in KELT-North survey data, and planetary nature occulter established using combination follow-up photometry, high-resolution imaging, spectroscopy, precise radial velocity measurements. fiducial model from global analysis including constraints isochrones indicates that V=10.38 host star (BD+31 2447) is mildly evolved, late-F with T_eff=6102 \pm 43 K,...
We announce the discovery of a highly inflated transiting hot Jupiter by KELT-North survey. A global analysis including constraints from isochrones indicates that V = 10.8 host star (HD 343246) is mildly evolved, G dwarf with K, , an inferred mass and radius . The planetary companion has MJ, RJ, surface gravity density g cm−3. planet on roughly circular orbit semimajor axis AU eccentricity best-fit linear ephemeris days. This one most all known exoplanets, making it few members class...
We report the discovery of HAT-P-67b, a hot-Saturn transiting rapidly rotating F-subgiant. HAT-P-67b has radius Rp = 2.085 -0.071/+0.096 RJ,, orbiting M* 1.642 -0.072/+0.155 Msun, R* 2.546 -0.084/+0.099 Rsun host star in ~4.81-day period orbit. place an upper limit on mass planet via radial velocity measurements to be Mp < 0.59 MJ, and lower > 0.056 MJ by limitations Roche lobe overflow. Despite being subgiant, still exhibits relatively rapid rotation, with projected rotational v sin I* 35.8...
We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with $V$ magnitudes in range $\sim 12-14$ and have masses largely populated $0.5M_J-0.7M_J$ region parameter space but span a wide variety radii, from $1.17R_J$ to $1.75 R_J$. HATS-25b, HATS-28b, HATS-29b HATS-30b are typical ($R_p = 1.17-1.26R_J$) orbiting G-type short period ($P=3.2-4.6$ days) orbits. However, HATS-26b 1.75R_J$,...
We report the discovery of two transiting extrasolar planets by HATSouth survey. HATS-9b orbits an old (10.8 $\pm$ 1.5 Gyr) V=13.3 G dwarf star, with a period P = 1.9153 d. The host star has mass 1.03 M$_{\odot}$, radius 1.503 R$_\odot$ and effective temperature 5366 70 K. planetary companion 0.837 M$_J$, 1.065 R$_J$ yielding mean density 0.85 g cm$^{-3}$ . HATS-10b V=13.1 3.3128 1.1 M$_\odot$, 1.11 5880 120 0.53 0.97 0.7 Both are compact in comparison receiving similar irradiation from...
The two reaction wheel K2 mission promises and has delivered new discoveries in the stellar exoplanet fields. However, due to loss of accurate pointing, it also brings challenges for data reduction processes. In this paper, we describe a pipeline extracting high precision photometry from dataset, present public light curves Campaign 1 target pixel dataset. Key our is derivation global astrometric solutions stamps, which centroids are passed on extraction. We extract sources combined UCAC4...
We report the discovery of KELT-4Ab, an inflated, transiting Hot Jupiter orbiting brightest component a hierarchical triple stellar system. The host star is F with = K, , and . best-fit linear ephemeris With magnitude V ∼ 10, planetary radius mass it among population inflated Jupiters (RP > 1.5RJ), making valuable for probing nature planets. In addition, its existence within proximity to Earth (210 pc) provide unique opportunity dynamical studies continued monitoring high resolution imaging...
We report the discovery and characterization of four transiting exoplanets by HATNet survey. The planet HAT-P-50b has a mass radius , orbits bright ( mag) star every days. HAT-P-51b mag, with period HAT-P-52b HAT-P-53b All planets are consistent having circular have masses radii measured to better than 10% precision. low stellar jitter favorable / ratio for HAT-P-51 make it promising target measuring Rossiter–McLaughlin effect Saturn-mass planet.
IW ../submit_V2/abstract.txt ( Row 1 Col 6:48 Ctrl-K H for help We report the discovery by HATSouth network of HATS-7b, a transiting Super-Neptune with mass 0.120+/-0.012MJ, radius 0.563+/-(0.046,0.034)RJ, and an orbital period 3.1853days. The host star is moderately bright (V=13.340+/-0.010mag, K_S=10.976+/-0.026mag) K dwarf 0.849+/-0.027Msun , 0.815+/-(0.049,-0.035)Rsun, metallicity [Fe/H]=+0.250+/-0.080. photometrically quiet to within precision measurements has low RV jitter. HATS-7b...