Search Publications
The Impact of Multifluid Effects in the Solar Chromosphere on the Ponderomotive Force under SE and NEQ Ionization Conditions
Testa, Paola; Martínez-Sykora, Juan; De Pontieu, Bart +3 more
The ponderomotive force has been suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect-the enrichment of low-FIP elements observed in the outer solar atmosphere, in the solar wind, and in solar energetic events. It is well known that the ionization of these elements occurs within the chromosphere. Ther…
Period-Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands
Gieren, Wolfgang; Pietrzyński, Grzegorz; Graczyk, Dariusz +6 more
We present the first period-luminosity (PL) and period-Wesenheit (PW) relations in the Sloan-Pan-STARRS g P1 r P1 i P1 bands for classical fundamental-mode Cepheids in the Milky Way. We used a relatively modest number of 76 stars for the PL and 84-85 stars for the PW relations calibration. The data for the proje…
White Dwarfs Revealed in Gaia's Candidate Compact Object Binaries
Chatterjee, Sourav; Nayak, Prasanta K.; Ganguly, Anindya
Discovery and characterization of black holes (BHs), neutron stars (NSs), and white dwarfs (WDs) with detached luminous companions (LCs) in wide orbits are exciting because they are important test beds for dark remnant (DR) formation physics as well as binary stellar evolution models. Recently, 187 candidates have been identified from Gaia's non-s…
Progenitor Constraint with Circumstellar Material for the Magnetar-hosting Supernova Remnant RCW 103
Uchida, Hiroyuki; Tsuru, Takeshi Go; Tanaka, Takaaki +2 more
Stellar winds blown out from massive stars (≳10 M ⊙) contain precious information on the progenitor itself, and in this context the most important elements are carbon (C), nitrogen (N), and oxygen (O), which are produced by the CNO cycle in the H-burning layer. Although their X-ray fluorescence lines are expected to be detected in swept…
Late-time Hubble Space Telescope Observations of AT 2018cow. I. Further Constraints on the Fading Prompt Emission and Thermal Properties 50-60 days Post-discovery
Kilpatrick, Charles D.; Drout, Maria R.; Foley, Ryan J. +6 more
The exact nature of the luminous fast blue optical transient AT 2018cow is still debated. In this first of a two-paper series, we present a detailed analysis of three Hubble Space Telescope (HST) observations of AT 2018cow covering ~50-60 days post-discovery in combination with other observations throughout the first two months and derive signific…
White Dwarfs with Infrared Excess from LAMOST Data Release 5
Wang, Lin; Gu, Wei-Min; Wang, Junfeng +5 more
Infrared (IR) excess is an important probe for substellar companions and/or debris disks around white dwarfs (WDs). Such systems are still rare, so an in-depth understanding of their formation and long-term evolution has yet to be developed. One of the largest spectroscopic surveys, carried out by the Large Sky Area Multi-Object Fibre Spectroscopi…
The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)
Zhao, Gang; Zhao, Jing-Kun; Yang, Yong +2 more
We provide a detailed analysis of the tidal tails of the globular cluster M3 (NGC 5272). We first discover clear extratidal structures with a slight S shape near the cluster. This inspires us to examine the existence of its long tidal tails. We highlight potential stream stars using the proper motions (PMs) of a model stream combined with the clus…
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Discovers an Overdensity around a Metal Absorption-selected Galaxy at z 5.5
Chevallard, Jacopo; Hennawi, Joseph F.; Fan, Xiaohui +27 more
The launch of JWST opens a new window for studying the connection between metal-line absorbers and galaxies at the end of the Epoch of Reionization. Previous studies have detected absorber-galaxy pairs in limited quantities through ground-based observations. To enhance our understanding of the relationship between absorbers and their host galaxies…
CLEAR: The Morphological Evolution of Galaxies in the Green Valley
Papovich, Casey; Cleri, Nikko J.; Giavalisco, Mauro +8 more
Quiescent galaxies having more compact morphologies than star-forming galaxies has been a consistent result in the field of galaxy evolution. What is not clear is at what point this divergence happens, i.e., when do quiescent galaxies become compact, and how big of a role does the progenitor effect play in this result? Here we aim to model the mor…
The Tilt of the Velocity Ellipsoid of Different Galactic Disk Populations
Sun, Weixiang; Shen, Han; Liu, Xiaowei
The tilt of the velocity ellipsoid is a helpful tracer of the gravitational potential of the Milky Way. In this paper, we use nearly 140,000 red clump (RC) stars selected from LAMOST and Gaia to make a detailed analysis of the tilt of the velocity ellipsoid for various populations, as defined by stellar ages and chemical information, within 4.5 ≤ …