Search Publications
Survey of complex organic molecules in starless and pre-stellar cores in the Perseus molecular cloud
Shirley, Yancy; Jiménez-Serra, Izaskun; Scibelli, Samantha +1 more
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A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008
Koekemoer, Anton M.; Mahler, Guillaume; Richard, Johan +18 more
MACS J0600.1-2008 (MACS0600) is an X-ray-luminous, massive galaxy cluster at $z_{\mathrm{d}}=0.43$, studied previously by the REionization LensIng Cluster Survey and ALMA Lensing Cluster Survey projects which revealed a complex, bimodal mass distribution and an intriguing high-redshift object behind it. Here, we report on the results of a combined…
TOI-4641b: an aligned warm Jupiter orbiting a bright (V=7.5) rapidly rotating F-star
Barclay, Thomas; Bieryla, Allyson; Latham, David W. +25 more
We report the discovery of TOI-4641b, a warm Jupiter transiting a rapidly rotating F-type star with a stellar effective temperature of 6560 K. The planet has a radius of 0.73 RJup, a mass smaller than 3.87 MJup(3σ), and a period of 22.09 d. It is orbiting a bright star (V=7.5 mag) on a circular orbit with a radius and mass of…
Dynamical masses across the Hertzsprung-Russell diagram
Ting, Yuan-Sen; Cheng, Sihao; Speagle, Joshua S. +1 more
We infer the dynamical masses of stars across the Hertzsprung-Russell (H-R) diagram using wide binaries from the Gaia survey. Gaia's high-precision astrometry measures the wide binaries' orbital motion, which contains the mass information. Using wide binaries as the training sample, we measure the mass of stars across the 2D H-R diagram using the …
The kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with JWST/NIRSpec
Rigopoulou, Dimitra; García-Bernete, Ismael; Donnan, Fergus R
Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in the interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditional methods, especially before the advent of the JWST. In this work, we employ Principal Component Analysis (PCA…
Quality flags for GSP-Phot Gaia DR3 astrophysical parameters with machine learning: effective temperatures case study
Zhao, Gang; Kovaleva, Dana A.; Avdeeva, Aleksandra S. +1 more
Gaia Data Release 3 (DR3) provides extensive information on the astrophysical properties of stars, such as effective temperature, surface gravity, metallicity, and luminosity, for over 470 million objects. However, as Gaia's stellar parameters in GSP-Phot module are derived through model-dependent methods and indirect measurements, it can lead to …
Peering into the Wolf-Rayet phenomenon through [WO] and [WC] stars
Toalá, Jesús A.; Todt, Helge; Sander, Andreas A. C.
Spectroscopic observations have shown for decades that the Wolf-Rayet (WR) phenomenon is ubiquitous among stars with different initial masses. Although much effort to understand the winds from massive WR stars has been presented in the literature, not much has been done for such type of stars in the low-mass range. Here we present an attempt to un…
North-South asymmetries in the Galactic thin disc associated with the vertical phase spiral as seen using LAMOST-Gaia stars
Tian, Haijun; Bird, Sarah A.; Liu, Gaochao +5 more
We select 1052 469 (754 635) thin disc stars from Gaia eDR3 and LAMOST DR7 in the range of Galactocentric radius R (guiding centre radius Rg) from 8 to 11 kpc to investigate the asymmetries between the North and South of the disc mid-plane. More specifically, we analyse the vertical velocity dispersion profiles ($\sigma _{v_{z}}(z$)) in…
Deciphering the Milky Way disc formation time encrypted in the bar chrono-kinematics
Belokurov, Vasily; Ardern-Arentsen, Anke; Zhang, Hanyuan +3 more
We present a novel method to constrain the formation time of the Milky Way disc using the chrono-kinematic signatures of the inner Galaxy. We construct an O-rich Mira variable sample from the Gaia long-period variable catalogue to study the kinematic behaviour of stars with different ages in the inner Galaxy. From the Auriga suite of cosmological …
X-ray spectral properties of dust-obscured galaxies in the XMM-SERVS coverage of the XMM-LSS field
Kayal, Abhijit; Singh, Veeresh
With an aim to unveil the population of obscured active galactic nuclei (AGN) hosted in high-z dust-obscured galaxies (DOGs), we performed X-ray spectral study of 34 DOGs (0.59 ≤ z ≤ 4.65) lying within 5.3 square degrees of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) coverage in the XMM-Large Scale Structure (XMM-LSS) fi…