Science Archives Publication System

Short arc orbit determination and imminent impactors in the Gaia era

DOI: 10.1051/0004-6361/201732104 Bibcode: 2018A&A...614A..27S

Mignard, F.; Tanga, P.; Carry, B. +6 more

Short-arc orbit determination is crucial when an asteroid is first discovered. In these cases usually the observations are so few that the differential correction procedure may not converge. We developed an initial orbit computation method, based on systematic ranging, which is an orbit determination technique that systematically explores a raster…

2018 • Astronomy and Astrophysics

Gaia 20

The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey Footprint. II. The North Galactic Cap Sample

DOI: 10.3847/1538-4357/aad2dd Bibcode: 2018ApJ...863..144S

Fan, Xiaohui; McGreer, Ian D.; Huang, Yun-Hsin +10 more

We present the North Galactic Cap sample of the Extremely Luminous Quasar Survey (ELQS-N), which targets quasars with M ₁₄₅₀ < -27 at 2.8 ≤ z < 5 in an area of ∼7600 deg² of the Sloan Digital Sky Survey (SDSS) footprint with 90° < R.A. < 270°. Based on a near-infrared/infrared JKW2 color cut, the ELQS selection ef…

2018 • The Astrophysical Journal

XMM-Newton eHST 20

The Future of Astrometry in Space

DOI: 10.3389/fspas.2018.00011 Bibcode: 2018FrASS...5...11V

Vallenari, Antonella

2018 • Frontiers in Astronomy and Space Sciences

Gaia Hipparcos 20

Two Warm, Low-density Sub-Jovian Planets Orbiting Bright Stars in K2 Campaigns 13 and 14

DOI: 10.3847/1538-3881/aad6e7 Bibcode: 2018AJ....156..127Y

Butler, R. Paul; Vanderburg, Andrew; Bieryla, Allyson +25 more

We report the discovery of two planets transiting the bright stars HD 89345 (EPIC 248777106, V = 9.376, K = 7.721) in K2 Campaign 14 and HD 286123 (EPIC 247098361, V = 9.822, K = 8.434) in K2 Campaign 13. Both stars are G-type stars, one of which is at or near the end of its main-sequence lifetime, and the other is just over halfway through its ma…

2018 • The Astronomical Journal

Gaia 20

Mapping polar atmospheric features on Titan with VIMS: From the dissipation of the northern cloud to the onset of a southern polar vortex

DOI: 10.1016/j.icarus.2018.04.028 Bibcode: 2018Icar..311..371L

Le Mouélic, S.; Cornet, T.; Rodriguez, S. +11 more

We have analyzed the complete archive of the Visual and Infrared Mapping Spectrometer (VIMS) data in order to monitor and analyze the evolution of the clouds and haze coverage at both poles of Titan during the entire Cassini mission. Our objective is to give a cartographic synopsis from a VIMS perspective, to provide a global view of the seasonal …

2018 • Icarus

Cassini 20

Extremely Dense Cores Associated with Chandra Sources in Ophiuchus A: Forming Brown Dwarfs Unveiled?

DOI: 10.3847/1538-4357/aae153 Bibcode: 2018ApJ...866..141K

Tamura, Yoichi; Di Francesco, James; Friesen, Rachel +15 more

On the basis of various data such as ALMA, JVLA, Chandra, Herschel, and Spitzer, we confirmed that two protostellar candidates in Oph A are bona fide protostars or proto-brown dwarfs (proto-BDs) in extremely early evolutionary stages. Both objects are barely visible across infrared (IR; i.e., near-IR to far-IR) bands. The physical nature of the co…

2018 • The Astrophysical Journal

Herschel 20

Prediction of astrometric microlensing events from Gaia DR2 proper motions

DOI: 10.1051/0004-6361/201833978 Bibcode: 2018A&A...620A.175K

Demleitner, M.; Bastian, U.; Wambsganss, J. +1 more

Context. Astrometric gravitational microlensing is an excellent tool to determine the mass of stellar objects. Using precise astrometric measurements of the lensed position of a background source in combination with accurate predictions of the positions of the lens and the unlensed source it is possible to determine the mass of the lens with an ac…

2018 • Astronomy and Astrophysics

Gaia 20

Isochrone Fitting of Hubble Photometry in UV-VIS-IR Bands

DOI: 10.1088/1538-3873/aaa597 Bibcode: 2018PASP..130c4204B

Paust, Nathaniel E. Q.; Barker, Hallie

We present new isochrone fits to color-magnitude diagrams from Hubble Space Telescope Wide Field Camera 3 and Advanced Camera for Surveys photometry of the globular clusters M13 and M80 in five bands from the ultraviolet to near-infrared. Isochrone fits to the photometry using the Dartmouth Stellar Evolution Program (DSEP), the PAdova and TRieste …

2018 • Publications of the Astronomical Society of the Pacific

eHST 20

X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275

DOI: 10.3847/1538-4357/aaabc0 Bibcode: 2018ApJ...855...93F

Fukazawa, Yasushi; Itoh, Ryosuke; Takahashi, Hiromitsu +6 more

We analyzed Suzaku/XIS data (2006-2015) and Fermi/LAT data (2008-2015) of the gamma-ray emitting radio galaxy NGC 1275. Correlated brightening of the nucleus in both the X-ray and GeV gamma-ray energy bands was found for the period 2013-2015. This is the first evidence of correlated variability between these two energy bands for NGC 1275. We also …

2018 • The Astrophysical Journal

Suzaku 20

Diffuse X-Ray-emitting Gas in Major Mergers

DOI: 10.3847/1538-3881/aaa1a6 Bibcode: 2018AJ....155...81S

Soria, Roberto; Struck, Curtis; Smith, Beverly J. +5 more

Using archived data from the Chandra X-ray telescope, we have extracted the diffuse X-ray emission from 49 equal-mass interacting/merging galaxy pairs in a merger sequence, from widely separated pairs to merger remnants. After the removal of contributions from unresolved point sources, we compared the diffuse thermal X-ray luminosity from hot gas …

2018 • The Astronomical Journal

eHST 20