Search Publications
Discovery of a split stellar stream in the periphery of the Small Magellanic Cloud
Nidever, David L.
I report the discovery of a stellar stream (Sutlej) using Gaia DR3 (third data release) proper motions and XP metallicities located
The visible and thermal light curve of the large Kuiper belt object (50000) Quaoar★
Pál, A.; Molnár, L.; Marton, G. +7 more
Recent stellar occultations have allowed accurate instantaneous size and apparent shape determinations of the large Kuiper belt object (50000) Quaoar and the detection of two rings with spatially variable optical depths. In this paper we present new visible range light curve data of Quaoar from the Kepler/K2 mission, and thermal light curves at 10…
Thermal Properties of the Hot Core Population in Sagittarius B2 Deep South.
Schilke, P.; Battersby, C.; Ginsburg, A. +7 more
We report the discovery of nine new hot molecular cores in the Deep South (DS) region of Sagittarius B2 using Atacama Large Millimeter/submillimeter Array Band 6 observations. We measure the rotational temperature of CH3OH and derive the physical conditions present within these cores and the hot core Sgr B2(S). The cores show heterogene…
Shadowing in the Protoplanetary Disk of ZZ Tau IRS with HST
Dong, Ruobing; Liu, Hauyu Baobab; Hashimoto, Jun +2 more
An inner component misaligned from an outer component in a protoplanetary disk can result in the former casting shadows on the latter. We present a new instance of shadowing on the outer disk around a very-low-mass star, ZZ Tau IRS. Through the analysis of near-infrared (NIR) archival data at λ = 1.6 µm acquired with the Wide Field Camera 3 …
FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use class III spectra to derive stellar and accretion properties
Alcalá, J. M.; Natta, A.; Manara, C. F. +10 more
Context. Studies of the stellar and accretion properties of classical T Tauri stars (CTTS) require photospheric spectral templates to be compared with. The use of low-activity, slowly rotating field dwarfs or model spectra can be advantageous for the determination of stellar parameters, but it can lead to an overestimate of the mass accretion rate…
Searching for new cataclysmic variables in the Chandra Source Catalog
Riddle, Reed; Szkody, Paula; El-Badry, Kareem +14 more
Aims. Cataclysmic variables (CVs) are compact binary systems in which a white dwarf accretes matter from a Roche-lobe-filling companion star. For this study we searched for new CVs in the Milky Way in the Chandra Source Catalog v2.0, cross-matched with Gaia Data Release 3 (DR3). Methods. We identified new CV candidates by combining X-ray and optic…
The astrophysical parameters of chemically peculiar stars from automatic methods
Paunzen, E.
Context. The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories for investigating the diffusion, mass loss, rotational mixing, and pulsation in the presence and absence of a stable local magnetic field. For this, we need a homogeneous set of parameters, such as effective temperature (Teff)…
Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000 K
Luo, A. -Li; Kong, Xiao; Li, Yinbi +5 more
In Data Release 9 of LAMOST, we present measurements of v sin i for a total of 121,698 stars measured using the Medium Resolution Spectrograph (MRS) and 80,108 stars using the Low Resolution Spectrograph (LRS). These values were obtained through a χ 2 minimization process, comparing LAMOST spectra with corresponding grids of synthetical…
JWST/NIRCam Imaging of Young Stellar Objects. I. Constraints on Planets Exterior to the Spiral Disk Around MWC 758
Dong, Ruobing; Wolff, Schuyler G.; Johnstone, Doug +18 more
MWC 758 is a young star hosting a spiral protoplanetary disk. The spirals are likely companion-driven, and two previously identified candidate companions have been identified—one at the end the Southern spiral arm at ∼0.″6, and one interior to the gap at ∼0.″1. With JWST/NIRCam, we provide new images of the disk and constraints on planets exterior…
A companion in V1247 Ori supported by motion in the pattern of the spiral arm
Kraus, Stefan; Debes, John H.; Dong, Ruobing +8 more
While nearly two dozen spiral arms have been detected from planet-forming disks in near-infrared scattered light, none of their substellar drivers has been confirmed. By observing spiral systems in at least two epochs spanning multiple years and measuring the motion of the spirals, we can distinguish what causes the spirals and locate the orbits o…