White dwarf magazine january 2019 drivers#

The Seventh Data Release of the Sloan Digital Sky Survey.

& Majewski, E.) 5вЂ“24 (Elsevier Science Academic Press, 2000).ДЄbazajian, K. In Earthquake Thermodynamics and Phase Transformation in the EarthвЂ™s Interior (eds Teisseyre, R. Doppler imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9. A Gaia Data Release 2 catalogue of white dwarfs and a comparison with SDSS.

White dwarf magazine january 2019 drivers#

Unstable low-mass planetary systems as drivers of white dwarf pollution. J., Villaver, E., Veras, D., GГ¤nsicke, B. Formation of undermassive single white dwarfs and the influence of planets on late stellar evolution. HAT-P-26b: a Neptune-mass exoplanet with a well-constrained heavy element abundance. HAT-P-26b: a low-density Neptune-mass planet transiting a K star. The extreme ultraviolet and X-ray sun in time: high-energy evolutionary tracks of a solar-like star. Hubble PanCET: an extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470b. A giant comet-like cloud of hydrogen escaping the warm Neptune-mass exoplanet GJ 436b. Probable detection of hydrogen sulphide (H 2S) in NeptuneвЂ™s atmosphere. Detection of hydrogen sulfide above the clouds in UranusвЂ™s atmosphere. The chemical diversity of exo-terrestrial planetary debris around white dwarfs. Tidal splitting and rotational breakup of solid spheres. Accurate stellar parameters for a cool 0.4 M в‰ white dwarf and a 0.16 M в‰ M dwarf in a 3 h eclipsing binary. Polluted white dwarfs: mixing regions and diffusion timescales. Gaseous material orbiting the polluted, dusty white dwarf HE 1349вЂ“2305. A gaseous metal disk around a white dwarf. Emission line formation in accretion discs. A photometric selection of white dwarf candidates in Sloan Digital Sky Survey Data Release 10. The chemical composition of an extrasolar Kuiper Belt Object. Eccentric planets and stellar evolution as a cause of polluted white dwarfs. The chemical composition of an extrasolar minor planet. Zuckerman, B., Koester, D., Melis, C., Hansen, B. A tidally disrupted asteroid around the white dwarf G29вЂ“38. The frequency of planetary debris around young white dwarfs. A disintegrating minor planet transiting a white dwarf. Excess infrared radiation from a white dwarf-an orbiting brown dwarf? Nature 330, 138вЂ“140 (1987). We infer an occurrence rate of approximately 1 in 10,000 for spectroscopically detectable giant planets in close orbits around white dwarfs. The orbit of the planet is most probably the result of gravitational interactions, indicating the presence of additional planets in the system. A giant planet orbiting a hot white dwarf with a semi-major axis of around 15 solar radii will undergo substantial evaporation with expected mass loss rates comparable to the accretion rate that we observe onto the white dwarf. The composition of this disk is unlike all other known planetary debris around white dwarfs 7, but resembles predictions for the makeup of deeper atmospheric layers of icy giant planets, with H 2O and H 2S being major constituents.

Here we report optical spectroscopy of a hot (about 27,750 kelvin) white dwarf, WDВ J091405.30+191412.25, that is accreting from a circumstellar gaseous disk composed of hydrogen, oxygen and sulfur at a rate of about 3.3В Г—В 10 9 grams per second.

Gravitational scattering of planetesimals towards the white dwarf requires the presence of more massive bodies 6, yet no planet has so far been detected at a white dwarf. The composition of these planetesimals is similar to that of rocky bodies in the inner Solar System 5. 2) confirmed that the photospheric trace metals found in many white dwarfs 3 arise from the accretion of tidally disrupted planetesimals 4. Each entry lists the name of the product, the publisher, the type of the product, and the name of the reviewer (with their overall score out of ten if available).The detection 1 of a dust disk around the white dwarf star G29-38 and transits from debris orbiting the white dwarf WD 1145+017 (ref. This is an index of every product reviewed in the Open Box column of White Dwarf magazine, from issue #1 to issue #93, Sorcerer to Chase. Ever wondered in which issue White Dwarf reviewed Nomad Gods? Or who only gave Mercenaries, Spies & Private Eyes a measly score of 4? And when did Open Box notoriously review itself? Well, wonder no more.