Search Publications
Prediction of Astrometric-microlensing Events from Gaia eDR3 Proper Motions
Bastian, Ulrich; Wambsganss, Joachim; Klüter, Jonas +1 more
Astrometric microlensing is a unique tool to measure stellar masses. It allows us to determine the mass of the lensing star with an accuracy of a few percent. In this paper, we update, extend, and refine our predictions of astrometric-microlensing events based on Gaia's early Data release 3 (eDR3). We selected about 500.000 high-proper-motion star…
Unveiling the Nature of SN 2011fh: A Young and Massive Star Gives Rise to a Luminous SN 2009ip-like Event
Kochanek, Christopher S.; Prieto, Jose L.; Fox, Ori D. +6 more
In recent years, many Type IIn supernovae have been found to share striking similarities with the peculiar SN 2009ip, whose true nature is still under debate. Here, we present 10 yr of observations of SN 2011fh, an interacting transient with spectroscopic and photometric similarities to SN 2009ip. SN 2011fh had an M r ~ -16 mag bright…
The Role of Magnetic Fields in Triggered Star Formation of RCW 120
Chen, Zhiwei; Sefako, Ramotholo; Jiang, Zhibo +3 more
We report on the near-infrared polarimetric observations of RCW 120 with the 1.4 m IRSF telescope. The starlight polarization of the background stars reveals for the first time the magnetic field of RCW 120. The global magnetic field of RCW 120 is along the direction of 20°, parallel to the Galactic plane. The field strength on the plane of the sk…
The search for gas in debris discs: ALMA detection of CO gas in HD 36546
Henning, Thomas; Villaver, Eva; Rivière-Marichalar, Pablo +9 more
Debris discs represent the last stages of planet formation and as such are expected to be depleted of primordial gas. None the less, in the last few years the presence of cold gas has been reported in ~20 debris discs from far-infrared to (sub-)mm observations and hot gas has been observed in the optical spectra of debris discs for decades. While …
The Disk-Outflow System around the Rare Young O-type Protostar W42-MME
Dewangan, L. K.; Ojha, D. K.; Mayya, Y. D. +6 more
We present line and continuum observations (resolution ~0.″3-3.″5) made with the Atacama Large Millimeter/submillimeter Array (ALMA), Submillimeter Array, and Very Large Array of a young O-type protostar W42-MME (mass: 19 ± 4 M ⊙). The ALMA 1.35 mm continuum map (resolution ~1″) shows that W42-MME is embedded in one of the cores (i.e., …
A census of post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars
Oudmaijer, René D.; Jones, Emma R. M.; Vioque, Miguel
This paper presents the first census of Galactic post-asymptotic giant branch (post-AGB) stars in the Hertzsprung-Russell (HR) diagram. We combined Gaia DR3 parallax-based distances with extinction corrected integrated fluxes and derived luminosities for a sample of 185 stars that had been proposed to be post-AGB stars in the literature. The lumin…
Disambiguation of Vector Magnetograms by Stereoscopic Observations from the Solar Orbiter (SO)/Polarimetric and Helioseismic Imager (PHI) and the Solar Dynamic Observatory (SDO)/Helioseismic and Magnetic Imager (HMI)
Hirzberger, Johann; Valori, Gherardo; Chen, Feng +3 more
Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by the 180∘ ambiguity in the orientation of the transverse component. The successful launch and operation of Solar Orbiter have made the removal of the 180∘ ambiguity possible using solely observations obtained from two dif…
Giant Planet Atmospheres: Dynamics and Variability from UV to Near-IR Hubble and Adaptive Optics Imaging
Wong, Michael H.; Fletcher, Leigh N.; Simon, Amy A. +2 more
Each of the giant planets, Jupiter, Saturn, Uranus, and Neptune, has been observed by at least one robotic spacecraft mission. However, these missions are infrequent; Uranus and Neptune have only had a single flyby by Voyager 2. The Hubble Space Telescope, particularly the Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) instrument…
Fundamental stellar parameters of benchmark stars from CHARA interferometry. II. Dwarf stars
White, T. R.; Casagrande, L.; Nordlander, T. +3 more
Context. Stellar models applied to large stellar surveys of the Milky Way need to be properly tested against a sample of stars with highly reliable fundamental stellar parameters. We have established a programme aiming to deliver such a sample of stars.
Aims: Here we present new fundamental stellar parameters of nine dwarf stars that will be …
A Snowball in Hell: The Potential Steam Atmosphere of TOI-1266c
Batalha, Natasha E.; Mahadevan, Suvrath; Hedges, Christina +4 more
TOI-1266c is a recently discovered super-Venus in the radius valley orbiting an early M dwarf. However, its notional bulk density (~2.2 g cm-3) is consistent with a large volatile fraction, suggesting that it might have volatile reservoirs that have survived billions of years at more than twice Earth's insolation. On the other hand, the…