Search Publications
The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
Kilpatrick, Charles D.; Simha, Sunil; Prochaska, J. Xavier +10 more
We present observations from the Gemini Multi-Conjugate Adaptive Optics System/Gemini South Adaptive Optics Imager at Gemini South of five fast radio burst (FRB) host galaxies of FRBs with subarcsecond localizations. We examine and quantify the spatial distributions and locations of the FRBs with respect to their host galaxy light distributions, f…
Modeling JWST MIRI-MRS Observations of T Cha: Mid-IR Noble Gas Emission Tracing a Dense Disk Wind
Pascucci, Ilaria; Gorti, Uma; Clarke, Cathie J. +8 more
[Ne II] 12.81 µm emission is a well-used tracer of protoplanetary disk winds due to its blueshifted line profile. Mid-Infrared Instrument (MIRI)-Medium Resolution Spectrometer (MRS) recently observed T Cha, detecting this line along with lines of [Ne III], [Ar II], and [Ar III], with the [Ne II] and [Ne III] lines found to be extended while …
Ultra-low-frequency LOFAR spectral indices of cluster radio halos
Di Gennaro, G.; Brunetti, G.; Tasse, C. +12 more
Context. A fraction of galaxy clusters harbor diffuse radio sources known as radio halos. The prevailing theory regarding their formation is based on second-order Fermi reacceleration of seed electrons caused by merger-driven turbulence in the intra-cluster medium. This mechanism is expected to be inefficient, which implies that a significant frac…
Star-formation activity of low-mass galaxies at the peak epoch of galaxy formation probed by deep narrow-band imaging
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +5 more
Low-mass galaxies at high redshifts are the building blocks of more massive galaxies at later times and are thus key populations for understanding galaxy formation and evolution. We have made deep narrow-band observations for two protoclusters and the general field in COSMOS at z ~ 2. In a clumpy young protocluster, USS1558-003, at z = 2.53, we fi…
Flares confirmed for the first time to be from the primary component of an eclipsing binary
Li, Kai; Gao, Xing; Sun, Guo-You +3 more
Only a handful of precise observations of flare detected from a contact binary so far. This paper presents the photometric and spectroscopic analysis of a contact binary (ASAS J082243+1927.0). Two flare events detected from this object were observed in the data of TESS. The two flare events both occurred at the secondary minimum. Considering the t…
A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS
Trifonov, Trifon; Henning, Thomas; Triaud, Amaury H. M. J. +48 more
We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Ground-based photometric and spectroscopic follow-up from different facilities, confirmed the substellar nature of…
How Gaia sheds light on the Milky Way star cluster population
Casamiquela, L.; Cantat-Gaudin, T.
Star clusters are among the first celestial objects catalogued by early astronomers. As simple and coeval populations, their study has been instrumental in charting the properties of the Milky Way and providing insight into stellar evolution through the 20th century. Clusters were traditionally spotted as local stellar overdensities in the plane o…
The history of star-forming regions in the tails of six GASP jellyfish galaxies observed with the Hubble Space Telescope
Fritz, J.; Werle, A.; Giunchi, E. +12 more
Aims: In this work, we aim to characterize the stellar populations of star-forming regions detached from the stellar disks of galaxies undergoing ram-pressure stripping.
Methods: Using images collected with the WFC3 camera on board of the Hubble Space Telescope, we detected stellar clumps in continuum-subtracted Hα and the ultraviolet (F…
Detection of 12 426 SB2 candidates in the LAMOST-MRS, using a binary spectral model
Han, Zhanwen; Kovalev, Mikhail; Zhou, Zenghua +1 more
We use an updated method for the detection of double-lined spectroscopic binaries (SB2s) using Vsin i values from spectral fits. The method is applied to all spectra from Large sky Area Multi-Object fiber Spectroscopic Telescope Medium Resolution Survey. Using this method, we detect 12 426 SB2 candidates, where 4321 are already known and 8105 are …
Detection and preliminary characterization of polluted white dwarfs from Gaia EDR3 and LAMOST
Vanderburg, Andrew; Seager, Sara; Badenas-Agusti, Mariona +4 more
We present a catalogue of 62 polluted white dwarfs observed by the 9th Low-Resolution Data Release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST LRS DR9v1; R≈1800) and the Early Data Release 3 (EDR3) of the Gaia Mission. Among these stellar remnants, 30 are new discoveries with previously unknown traces of calcium pollut…