output
19912026
Showing 2014 · astro-ph.SRShow all

29 papers · 2 filters

astro-ph.SR2014★ 54 cited

Multiwaveband photometry of the irradiated brown dwarf WD0137-349B

S. L. Casewell, K. A. Lawrie, P. F. L. Maxted +7

WD0137-349 is a white dwarf-brown dwarf binary system in a 116 minute orbit. We present radial velocity observations and multiwaveband photometry from V, R and I in the optical, to…

astro-ph.SR2014★ 42 cited

Time-Varying Potassium in High-Resolution Spectra of the Type Ia Supernova 2014J

M. L. Graham, S. Valenti, B. J. Fulton +9

We present a time series of the highest resolution spectra yet published for the nearby Type Ia supernova (SN) 2014J in M82. They were obtained at 11 epochs over 33 days around pea…

astro-ph.SR2014★ 138 cited

HST hot-Jupiter transmission spectral survey: Haze in the atmosphere of WASP-6b

N. Nikolov, D. K. Sing, A. S. Burrows +14

We report Hubble Space Telescope (HST) optical to near-infrared transmission spectroscopy of the hot Jupiter WASP-6b, measured with the Space Telescope Imaging Spectrograph (STIS)…

astro-ph.SR2014★ 84 cited

Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds

S. K. Leggett, Caroline V. Morley, M. S. Marley +1

We present new near-infrared photometry for seven late-type T dwarfs and nine Y-type dwarfs, and lower limit magnitudes for a tenth Y dwarf, obtained at Gemini Observatory. We also…

astro-ph.SR2014★ 72 cited

Cloud structure of the nearest brown dwarfs: Spectroscopic variability of Luhman 16AB from the Hubble Space Telescope

Esther Buenzli, Didier Saumon, Mark. S. Marley +5

The binary brown dwarf WISE J104915.57531906.1 (also Luhman 16AB), composed of a late L and early T dwarf, is a prototypical L/T transition flux reversal binary located at only…

astro-ph.SR2014★ 52 cited

Stellar Models of Multiple Populations in Globular Clusters. I. The Main Sequence of NGC 6752

Aaron Dotter, Jason Ferguson, Charlie Conroy +3

We present stellar atmosphere and evolution models of main sequence stars in two stellar populations of the Galactic globular cluster NGC 6752. These populations represent the two…

astro-ph.SR2014★ 21 cited

The effect of external environment on the evolution of protostellar disks

Eduard I. Vorobyov, D. N. C. Lin, Manuel Guedel

Using numerical hydrodynamics simulations we studied the gravitational collapse of pre-stellar cores of sub-solar mass embedded into a low-density external environment. Four models…

astro-ph.SR2014★ 75 cited

The Luminosities of the Coldest Brown Dwarfs

C. G. Tinney, Jacqueline K. Faherty, J. Davy Kirkpatrick +3

In recent years brown dwarfs have been extended to a new Y-dwarf class with effective temperatures colder than 500K and masses in the range 5-30 Jupiter masses. They fill a crucial…

astro-ph.SR2014★ 97 cited

On the Accretion-Fed Growth of Neutron Stars During Common Envelope

Morgan MacLeod, Enrico Ramirez-Ruiz

This paper models the orbital inspiral of a neutron star (NS) through the envelope of its giant-branch companion during a common envelope (CE) episode. These CE episodes are necess…

astro-ph.SR2014★ 124 cited

Asymmetric Accretion Flows within a Common Envelope

Morgan MacLeod, Enrico Ramirez-Ruiz

This paper examines flows in the immediate vicinity of stars and compact objects dynamically inspiralling within a common envelope (CE). Flow in the vicinity of the embedded object…

astro-ph.SR2014★ 30 cited

Evolution of Exoplanets and their Parent Stars

Tristan Guillot, Douglas N. C. Lin, Pierre Morel +2

Studying exoplanets with their parent stars is crucial to understand their population, formation and history. We review some of the key questions regarding their evolution with par…

astro-ph.SR2014★ 36 cited

Discovery of a new Y dwarf: WISE J030449.03-270508.3

D. J. Pinfield, M. Gromadzki, S. K. Leggett +21

We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a candidate sample designed to pick out low temperature objects from the WISE database. The new object is typed Y…

astro-ph.SR2014★ 12 cited

Double-diffusive mixing in stellar interiors in the presence of horizontal gradients

Michael Medrano, Pascale Garaud, Stephan Stellmach

We have identified an important source of mixing in stellar radiation zones, that would arise whenever two conditions are satisfied: (1) the presence of an inverse vertical composi…

astro-ph.SR2014★ 29 cited

Fingering convection induced by atomic diffusion in stars: 3D numerical computations and applications to stellar models

Varvara Zemskova, Pascale Garaud, Morgan Deal +1

Iron-rich layers are known to form in the stellar subsurface through a combination of gravitational settling and radiative levitation. Their presence, nature and detailed structure…

astro-ph.SR2014★ 56 cited

The Deaths of Very Massive Stars

S. E. Woosley, Alexander Heger

The theory underlying the evolution and death of stars heavier than 10 Msun on the main sequence is reviewed with an emphasis upon stars much heavier than 30 Msun. These are stars…

astro-ph.SR2014★ 59 cited

Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-Candidate Hosts

Philip S. Muirhead, Juliette Becker, Gregory A. Feiden +12

We present H- and K-band spectra for late-type Kepler Objects of Interest (the "Cool KOIs"): low-mass stars with transiting-planet candidates discovered by NASA's Kepler Mission th…

astro-ph.SR2014★ 80 cited

Evolution of Thermally Pulsing Asymptotic Giant Branch Stars IV. Constraining Mass-Loss & Lifetimes of Low Mass, Low Metallicity AGB Stars

Philip Rosenfield, Paola Marigo, Leo Girardi +7

The evolution and lifetimes of thermally pulsating asymptotic giant branch (TP-AGB) stars suffer from significant uncertainties. In this work, we analyze the numbers and luminosity…

astro-ph.SR2014★ 78 cited

Spectral Variability from the Patchy Atmospheres of T and Y Dwarfs

Caroline V. Morley, Mark S. Marley, Jonathan J. Fortney +1

Brown dwarfs of a variety of spectral types have been observed to be photometrically variable. Previous studies have focused on objects at the L/T transition, where the iron and si…

astro-ph.SR2014★ 54 cited

Constraints for the Progenitor Masses of 17 Historic Core-Collapse Supernovae

Benjamin F. Williams, Skyler Peterson, Jeremiah Murphy +4

Using resolved stellar photometry measured from archival HST imaging, we generate color-magnitude diagrams of the stars within 50 pc of the locations of historic core-collapse supe…

astro-ph.SR2014★ 22 cited

Structure and Dynamics of the Accretion Process and Wind in TW Hya

A. K. Dupree, N. S. Brickhouse, S. R. Cranmer +3

Time-domain spectroscopy of the classical accreting T Tauri star, TW Hya, covering a decade and spanning the far UV to the near-infrared spectral regions can identify the radiation…

astro-ph.SR2014★ 104 cited

Gone With the Wind: Where is the Missing Stellar Wind Energy from Massive Star Clusters?

Anna L. Rosen, Laura A. Lopez, Mark R. Krumholz +1

Star clusters larger than contain multiple hot stars that launch fast stellar winds. The integrated kinetic energy carried by these winds is comparable to t…

astro-ph.SR2014★ 289 cited

Angular momentum transport within evolved low-mass stars

Matteo Cantiello, Christopher Mankovich, Lars Bildsten +2

Asteroseismology of 1.0-2.0 Msun red giants by the Kepler satellite has enabled the first definitive measurements of interior rotation in both first ascent red giant branch (RGB) s…

astro-ph.SR2014★ 190 cited

Water Clouds in Y Dwarfs and Exoplanets

Caroline V. Morley, Mark S. Marley, Jonathan J. Fortney +4

The formation of clouds affects brown dwarf and planetary atmospheres of nearly all effective temperatures. Iron and silicate condense in L dwarf atmospheres and dissipate at the L…

astro-ph.SR2014★ 38 cited

The Formation of Very Massive Stars

Mark R. Krumholz

In this chapter I review theoretical models for the formation of very massive stars. After a brief overview of some relevant observations, I spend the bulk of the chapter describin…