Science Archives Publication System

The primordial nucleus of comet 67P/Churyumov-Gerasimenko

DOI: 10.1051/0004-6361/201526968 Bibcode: 2016A&A...592A..63D

Jorda, L.; Lamy, P. L.; Lara, L. M. +45 more

Context. We investigate the formation and evolution of comet nuclei and other trans-Neptunian objects (TNOs) in the solar nebula and primordial disk prior to the giant planet orbit instability foreseen by the Nice model.
Aims: Our goal is to determine whether most observed comet nuclei are primordial rubble-pile survivors that formed in the s…

2016 • Astronomy and Astrophysics

Rosetta 158

Q1549-C25: A Clean Source of Lyman-Continuum Emission at z = 3.15

DOI: 10.3847/2041-8205/826/2/L24 Bibcode: 2016ApJ...826L..24S

Siana, Brian; Shapley, Alice E.; Steidel, Charles C. +5 more

We present observations of Q1549-C25, an ∼ {L}^* star-forming galaxy at z = 3.15 for which Lyman-continuum (LyC) radiation is significantly detected in deep Keck/LRIS spectroscopy. We find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of Q1549-C25. Furthermo…

2016 • The Astrophysical Journal

eHST 157

A radio-pulsing white dwarf binary star

DOI: 10.1038/nature18620 Bibcode: 2016Natur.537..374M

Gänsicke, B. T.; Dhillon, V. S.; Pala, A. F. +23 more

White dwarfs are compact stars, similar in size to Earth but approximately 200,000 times more massive. Isolated white dwarfs emit most of their power from ultraviolet to near-infrared wavelengths, but when in close orbits with less dense stars, white dwarfs can strip material from their companions and the resulting mass transfer can generate atomi…

2016 • Nature

Herschel eHST 157

Refractory and semi-volatile organics at the surface of comet 67P/Churyumov-Gerasimenko: Insights from the VIRTIS/Rosetta imaging spectrometer

DOI: 10.1016/j.icarus.2016.02.028 Bibcode: 2016Icar..272...32Q

Fornasier, S.; Erard, S.; Drossart, P. +34 more

The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument aboard the Rosetta spacecraft has performed extensive spectral mapping of the surface of comet 67P/Churyumov-Gerasimenko in the range 0.3-5 µm. The reflectance spectra collected across the surface display a low reflectance factor over the whole spectral range, two spe…

2016 • Icarus

Rosetta 157

The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk

DOI: 10.3847/0004-637X/832/2/110 Bibcode: 2016ApJ...832..110C

Wilner, David J.; Cleeves, L. Ilsedore; Andrews, Sean M. +4 more

The spatial distribution of gas and solids in protoplanetary disks determines the composition and formation efficiency of planetary systems. A number of disks show starkly different distributions for the gas and small grains compared to millimeter-centimeter-sized dust. We present new Atacama Large Millimeter/Submillimeter Array observations of th…

2016 • The Astrophysical Journal

Gaia 156

The faint radio sky: radio astronomy becomes mainstream

DOI: 10.1007/s00159-016-0098-6 Bibcode: 2016A&ARv..24...13P

Padovani, Paolo

Radio astronomy has changed. For years it studied relatively rare sources, which emit mostly non-thermal radiation across the entire electromagnetic spectrum, I.e. radio quasars and radio galaxies. Now, it is reaching such faint flux densities that it detects mainly star-forming galaxies and the more common radio-quiet active galactic nuclei. Thes…

2016 • Astronomy and Astrophysics Review

eHST 155

Beyond 31 mag arcsec^-2: The Frontier of Low Surface Brightness Imaging with the Largest Optical Telescopes

DOI: 10.3847/0004-637X/823/2/123 Bibcode: 2016ApJ...823..123T

Trujillo, Ignacio; Fliri, Jüergen

The detection of structures in the sky with optical surface brightnesses fainter than 30 mag arcsec^-2 (3σ in 10 × 10 arcsec boxes; r-band) has remained elusive in current photometric deep surveys. Here we show how present-day telescopes of 10 m class can provide broadband imaging 1.5-2 mag deeper than most previous results within a reas…

2016 • The Astrophysical Journal

Planck 154

Aggregate dust particles at comet 67P/Churyumov-Gerasimenko

DOI: 10.1038/nature19091 Bibcode: 2016Natur.537...73B

Jessberger, Elmar K.; Torkar, Klaus; Levasseur-Regourd, Anny-Chantal +9 more

Comets are thought to preserve almost pristine dust particles, thus providing a unique sample of the properties of the early solar nebula. The microscopic properties of this dust played a key part in particle aggregation during the formation of the Solar System. Cometary dust was previously considered to comprise irregular, fluffy agglomerates on …

2016 • Nature

Rosetta 154

The Atmospheric Circulation of a Nine-hot-Jupiter Sample: Probing Circulation and Chemistry over a Wide Phase Space

DOI: 10.3847/0004-637X/821/1/9 Bibcode: 2016ApJ...821....9K

Fortney, Jonathan J.; Sing, David K.; Kataria, Tiffany +4 more

We present results from an atmospheric circulation study of nine hot Jupiters that compose a large transmission spectral survey using the Hubble and Spitzer Space Telescopes. These observations exhibit a range of spectral behavior over optical and infrared wavelengths, suggesting diverse cloud and haze properties in their atmospheres. By utilizing…

2016 • The Astrophysical Journal

eHST 153

Magnetohydrodynamic simulation of interplanetary propagation of multiple coronal mass ejections with internal magnetic flux rope (SUSANOO-CME)

DOI: 10.1002/2015SW001308 Bibcode: 2016SpWea..14...56S

Kataoka, R.; Shiota, D.

Coronal mass ejections (CMEs) are the most important drivers of various types of space weather disturbance. Here we report a newly developed magnetohydrodynamic (MHD) simulation of the solar wind, including a series of multiple CMEs with internal spheromak-type magnetic fields. First, the polarity of the spheromak magnetic field is set as determin…

2016 • Space Weather

SOHO 153