Search Publications
Detections of Dust in the Outskirts of M31 and M33
Ruoyi, Zhang; Haibo, Yuan
M31 and M33 serve as ideal places to study distributions of dust in the outskirts of spiral galaxies. In this Letter, using about 0.2 million stars selected from the LAMOST data and combining precise photometry and parallaxes from the Gaia DR2, we have constructed a two-dimensional foreground dust reddening map toward the M31 and M33 region (111°2…
Using Gaia DR2 to solve differential colour refraction and charge transfer efficiency issues
Lin, F. R.; Peng, Q. Y.; Zheng, Z. J.
The Gaia DR2 catalogue released in 2018 gives information about more than one billion stars, including their extremely precise positions that are not affected by the atmosphere, as well as the magnitudes in the G, RP, and BP passbands. This information provides great potential for the improvement of the ground-based astrometry. Based on Gaia DR2, …
2MASS J15491331-3539118: a new low-mass wide companion of the GQ Lup system
Alcalá, J. M.; Manara, C. F.; D'Orazi, V. +14 more
Substellar companions at wide separation around stars hosting planets or brown dwarfs (BDs) yet close enough for their formation in the circumstellar disc are of special interest. In this Letter we report the discovery of a wide (projected separation ∼16.0", or 2400 AU, and position angle 114.61°) companion of the GQ Lup A-B system, most likely gr…
The Swift Bulge Survey: optical and near-IR follow-up featuring a likely symbiotic X-ray binary and a focused wind CV
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +13 more
The nature of very faint X-ray transients (VFXTs) - transient X-ray sources that peak at luminosities L_X≲ 10^{36} { erg s^{-1}} - is poorly understood. The faint and often short-lived outbursts make characterizing VFXTs and their multiwavelength counterparts difficult. In 2017 April we initiated the Swift Bulge Survey, a shallow X-ray survey of ∼…
Detection of Small Flares from the Crab Nebula with Fermi-LAT
Uchiyama, Yasunobu; Hayashida, Masaaki; Khangulyan, Dmitry +1 more
Gamma radiation from the Crab pulsar wind nebula (PWN) shows significant variability at ∼100 MeV energies, recently revealed with spaceborne gamma-ray telescopes. Here we report the results of a systematic search for gamma-ray flares using a 7.4 yr data set acquired with the Fermi Large Area Telescope. Analyzing the off-pulse phases of the Crab pu…
Atmosphere Models of Brown Dwarfs Irradiated by White Dwarfs: Analogs for Hot and Ultrahot Jupiters
Lothringer, Joshua D.; Casewell, Sarah L.
Irradiated brown dwarfs (BDs) provide natural laboratories to test our understanding of substellar and irradiated atmospheres. A handful of short-period BDs around white dwarfs (WDs) have been observed, but the uniquely intense UV-dominated irradiation presents a modeling challenge. Here, we present the first fully self-consistent 1D atmosphere mo…
A Model for Coronal Inflows and In/Out Pairs
Lynch, Benjamin J.
This report presents a three-dimensional (3D) numerical magnetohydrodynamics (MHD) model of the white-light coronagraph observational phenomena known as coronal inflows and in/out pairs. Coronal inflows in the Large Angle and Spectrometric Coronagraph/C2 field of view (approximately $2\mbox{--}6\,{R}_{\odot }$ ) were thought to arise from the dyna…
Spatial power spectra of dust across the Local Group: No constraint on disc scale height
Sandstrom, Karin M.; Leroy, Adam K.; Koch, Eric W. +4 more
We analyse the 1D spatial power spectra of dust surface density and mid to far-infrared emission at 24-500 µm in the LMC, SMC, M31, and M33. By forward-modelling the point spread function (PSF) on the power spectrum, we find that nearly all power spectra have a single power-law and point source component. A broken power-law model is only fav…
Structural and Dynamical Analysis of 0.1 pc Cores and Filaments in the 30 Doradus-10 Giant Molecular Cloud
Lebouteiller, Vianney; Indebetouw, Rémy; Wong, Tony +4 more
High-resolution (<0.1 pc) Atacama Large Millimeter/submillimeter Array (ALMA) observations of the 30Dor-10 molecular cloud 15 pc north of R136 are presented. The 12CO 2-1 emission morphology contains clumps near the locations of known mid-IR massive protostars, as well as a series of parsec-long filaments oriented almost directly tow…
The post-common-envelope binary central star of the planetary nebula PN G283.7-05.1. A possible post-red-giant-branch planetary nebula central star
Corradi, R. L. M.; Boffin, H. M. J.; Jones, D. +8 more
We present the discovery and characterisation of the post-common-envelope central star system in the planetary nebula PN G283.7-05.1. Deep images taken as part of the POPIPlaN survey indicate that the nebula may possess a bipolar morphology similar to other post-common-envelope planetary nebulae. Simultaneous light and radial velocity curve modell…