Search Publications
The eccentricity distribution of wide binaries and their individual measurements
Ting, Yuan-Sen; Zakamska, Nadia L.; Hwang, Hsiang-Chih
Eccentricity of wide binaries is difficult to measure due to their long orbital periods. With Gaia's high-precision astrometric measurements, eccentricity of a wide binary can be constrained by the angle between the separation vector and the relative velocity vector (the v-r angle). In this paper, by using the v-r angles of wide binaries in Gaia E…
The Type Icn SN 2021csp: Implications for the Origins of the Fastest Supernovae and the Fates of Wolf-Rayet Stars
Kulkarni, S. R.; Filippenko, Alexei V.; Duev, Dmitry A. +32 more
We present observations of SN 2021csp, the second example of a newly identified type of supernova (SN) hallmarked by strong, narrow, P Cygni carbon features at early times (Type Icn). The SN appears as a fast and luminous blue transient at early times, reaching a peak absolute magnitude of -20 within 3 days due to strong interaction between fast S…
Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. II. Elemental Abundances
Shi, Jianrong; Zhao, Gang; Chen, Yuqin +9 more
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 new objects) studied by a single program, and the first attempt to accurately determine evolutionary stages fo…
The Low-Redshift Lyman Continuum Survey. Unveiling the ISM properties of low-z Lyman-continuum emitters
Giavalisco, Mauro; Grazian, Andrea; Pentericci, Laura +24 more
Aims: Combining 66 ultraviolet (UV) spectra and ancillary data from the recent Low-Redshift Lyman Continuum Survey (LzLCS) and 23 LyC observations by earlier studies, we form a statistical sample of star-forming galaxies at z ∼ 0.2 − 0.4 with which we study the role of cold interstellar medium (ISM) gas in the leakage of ionizing radiation. W…
Five Key Exoplanet Questions Answered via the Analysis of 25 Hot-Jupiter Atmospheres in Eclipse
Tsiaras, A.; Waldmann, I. P.; Tinetti, G. +11 more
Population studies of exoplanets are key to unlocking their statistical properties. So far, the inferred properties have been mostly limited to planetary, orbital, and stellar parameters extracted from, e.g., Kepler, radial velocity, and Gaia data. More recently an increasing number of exoplanet atmospheres have been observed in detail from space …
Probing inner and outer disk misalignments in transition disks. Constraints from VLTI/GRAVITY and ALMA observations
Ménard, F.; Henning, T.; Ginski, C. +16 more
Context. Transition disks are protoplanetary disks with dust-depleted cavities, possibly indicating substantial clearing of their dust content by a massive companion. For several known transition disks, dark regions interpreted as shadows have been observed in scattered light imaging and are hypothesized to originate from misalignments between dis…
A rich population of free-floating planets in the Upper Scorpius young stellar association
Tamura, Motohide; Cuillandre, Jean-Charles; Bertin, Emmanuel +9 more
The nature and origin of free-floating planets (FFPs) are still largely unconstrained because of a lack of large homogeneous samples to enable a statistical analysis of their properties. So far, most FFPs have been discovered using indirect methods; microlensing surveys have proved particularly successful to detect these objects down to a few Eart…
Dayside Transient Phenomena and Their Impact on the Magnetosphere and Ionosphere
Zong, Qiugang; Lin, Yu; Kallio, Esa +17 more
Dayside transients, such as hot flow anomalies, foreshock bubbles, magnetosheath jets, flux transfer events, and surface waves, are frequently observed upstream from the bow shock, in the magnetosheath, and at the magnetopause. They play a significant role in the solar wind-magnetosphere-ionosphere coupling. Foreshock transient phenomena, associat…
The Planck clusters in the LOFAR sky. I. LoTSS-DR2: New detections and sample overview
Simionescu, A.; Zhang, X.; Di Gennaro, G. +23 more
Context. Relativistic electrons and magnetic fields permeate the intra-cluster medium (ICM) and manifest themselves as diffuse sources of synchrotron emission observable at radio wavelengths, namely radio halos and radio relics. Although there is broad consensus that the formation of these sources is connected to turbulence and shocks in the ICM, …
Stellar labels for hot stars from low-resolution spectra. I. The HotPayne method and results for 330 000 stars from LAMOST DR6
Xiang, Maosheng; Conroy, Charlie; Ting, Yuan-Sen +9 more
We set out to determine stellar labels from low-resolution survey spectra of hot stars, specifically OBA stars with Teff ≳ 7500 K. This fills a gap in the scientific analysis of large spectroscopic stellar surveys such as LAMOST, which offers spectra for millions of stars at R ~ 1800 and covers 3800 Å ≤ λ ≤ 9000 Å. We first explore the …