Search Publications
The Kraft Break Sharply Divides Low-mass and Intermediate-mass Stars
White, Russel J.; Beyer, Alexa C.
Main-sequence stars transition at mid-F spectral types from slowly rotating (cooler stars) to rapidly rotating (hotter stars), a transition known as the Kraft Break and attributed to the disappearance of the outer convective envelope, causing magnetic braking to become ineffective. To define this Break more precisely, we assembled spectroscopic me…
Catalogue of BRITE-Constellation targets. I. Fields 1 to 14 (November 2013-April 2016)
Smolec, R.; Handler, G.; Wade, G. A. +25 more
Context. The BRIght Target Explorer (BRITE) mission collects photometric time series in two passbands with the aim of investigating stellar structure and evolution. Since their launches in the years 2013 and 2014, the constellation of five BRITE nano-satellites has observed a total of more than 700 individual bright stars in 64 fields. Some target…
A Close Look at Lyα Emitters with JWST/NIRCam at z ≈ 3.1
Jiang, Linhua; Wuyts, Stijn; Huang, Jia-Sheng +2 more
We study 10 spectroscopically confirmed Lyα emitters (LAEs) at z ≈ 3.1 in the Ultra Deep Survey field, covered by the James Webb Space Telescope/NIRCam in the Public Release Imaging for Extragalactic Research program. All LAEs are detected in all NIRCam bands from F090W to F444W, corresponding to rest frame wavelengths of 2200 Å to 1.2 µm. B…
Radial velocities from Gaia BP/RP spectra
Kuijken, Konrad; Koposov, Sergey E.; Verberne, Sill +3 more
Aims: The Gaia mission has provided us full astrometric solutions for over 1.5B sources. However, only the brightest 34M of them have radial velocity measurements. This paper aims to close that gap by obtaining radial velocity estimates from the low-resolution BP/RP spectra that Gaia now provides. These spectra are currently published for abo…
Discovery of a Second Eclipsing, Bursting Neutron Star Low-mass X-Ray Binary in the Globular Cluster Terzan 6
Bahramian, Arash; Homan, Jeroen; Heinke, Craig O. +4 more
We have analyzed Chandra and Suzaku observations of the globular cluster Terzan 6, made when the recurrent transient GRS 1747–312 was in quiescence. Our analysis reveals the presence of a second eclipsing, bursting neutron star low-mass X-ray binary in the central regions of the cluster, in addition to GRS 1747–312. The new source, which we name T…
Double red giant branch and red clump features of Galactic disc stellar populations with Gaia GSP-Spec
Recio-Blanco, A.; de Laverny, P.; Palicio, P. A. +4 more
Context. The bimodality of the Milky Way disc, in the form of a thick short disc and a thinner more radially extended one, encrypts the complex internal evolution of our Galaxy and its interaction with the environment. Aims. To disentangle the different competing physical processes at play in Galactic evolution, a detailed chrono-chemical-kinemati…
The Interplay Between Collisionless Magnetic Reconnection and Turbulence
Hasegawa, H.; Khotyaintsev, Yu. V.; Graham, D. B. +13 more
Alongside magnetic reconnection, turbulence is another fundamental nonlinear plasma phenomenon that plays a key role in energy transport and conversion in space and astrophysical plasmas. From a numerical, theoretical, and observational point of view there is a long history of exploring the interplay between these two phenomena in space plasma env…
Testing Magnetospheric Accretion as an Hα Emission Mechanism of Embedded Giant Planets: The Case Study for the Disk Exhibiting Meridional Flow Around HD 163296
Tamura, Motohide; Uyama, Taichi; Hashimoto, Jun +7 more
Recent high-sensitivity observations reveal that accreting giant planets embedded in their parental circumstellar disks can emit Hα at their final formation stages. While the origin of this emission is not yet determined, magnetospheric accretion is currently the most plausible hypothesis. In order to test this hypothesis further, we develop a sim…
Physical Parameters and Properties of 20 Cold Brown Dwarfs in JWST
Liu, Jifeng; Wang, Shu; Tu, Zhijun
We present a comprehensive analysis of 20 T and Y dwarfs using spectroscopy from the Near-Infrared Spectrograph (NIRSpec) CLEAR/PRISM and Mid-Infrared Instrument (MIRI) low-resolution spectrometer instruments on the James Webb Space Telescope. To characterize the atmospheric parameters, we utilize two atmospheric model grids: the Sonora Elf Owl an…
Generating synthetic star catalogs from simulated data for next-gen observatories with py-ananke
Sharma, Sanjib; Sanderson, Robyn; Garavito-Camargo, Nicolás +4 more
We find ourselves on the brink of an exciting era in observational astrophysics, driven by groundbreaking facilities like JWST, Euclid, Rubin, Roman, SKA, or ELT. Simultaneously, computational astrophysics has shown significant strides, yielding highly realistic galaxy formation simulations, thanks to both hardware and software enhancements. Bridg…