Search Publications
The nuclear environment of NGC 2442: a Compton-thick low-luminosity AGN
Steiner, J. E.; Menezes, R. B.; da Silva, Patrícia +2 more
The detailed study of nuclear regions of galaxies is important because it can help understanding the active galactic nucleus (AGN) feedback mechanisms, the connections between the nuclei and their host galaxies, and ultimately the galaxy formation processes. We present the analysis of an optical data cube of the central region of the galaxy NGC 24…
The Young Stellar Population, Distance, and Cloud-Cloud Collision Induced Star Formation Scenario of the Trifid Nebula
Kalari, Venu M.
The Trifid Nebula is a young, nearby star-forming region where star formation is proposed to have been triggered by cloud-cloud collision (CCC), based on observations of molecular clouds. It offers a unique opportunity to test whether the CCC hypothesis is supported by the spatial distribution and star formation chronology of young stars. We prese…
Segmentation of Coronal Features to Understand the Solar EUV and UV Irradiance Variability III. Inclusion and Analysis of Bright Points
Giono, Gabriel; van der Zwaard, Rens; Kariyappa, Rangaiah +3 more
The study of solar irradiance variability is of great importance in heliophysics, Earth's climate, and space weather applications. These studies require careful identifying, tracking and monitoring of features in the solar photosphere, chromosphere, and corona. Do coronal bright points contribute to the solar irradiance or its variability as input…
Low-redshift Type Ia Supernova from the LSQ/LCO Collaboration
Howell, D. A.; McCully, C.; Baltay, C. +16 more
This paper is the data release of a new sample of 140 type Ia supernovae (SNe Ia) from the LaSilla-QUEST/Las Cumbres Observatory (LCO) collaboration. The discovery of the supernovae came from the LaSilla-QUEST variability survey, the ASASSN survey, as well as smaller low redshift supernova surveys. All of the supernovae in this sample were spectro…
Detection of an energetic flare from the M5V secondary star in the Polar MQ Dra
Ramsay, Gavin; Hakala, Pasi; Wood, Matt A.
MQ Dra is a strongly magnetic Cataclysmic Variable whose white dwarf accretes material from its secondary star through a stellar wind at a low rate. TESS observations were made of MQ Dra in four sectors in Cycle 2 and show a short duration, high energy flare (~1035 erg) which has a profile characteristic of a flare from the M5V secondar…
A VLA Survey of Late-time Radio Emission from Superluminous Supernovae and the Host Galaxies
Tamura, Yoichi; Tominaga, Nozomu; Hatsukade, Bunyo +5 more
We present the results of 3 GHz radio continuum observations of 23 superluminous supernovae (SLSNe) and their host galaxies by using the Karl G. Jansky Very Large Array conducted 5-21 yr after the explosions. The sample consists of 15 Type I and 8 Type II SLSNe at z < 0.3, providing one of the largest samples of SLSNe with late-time radio data.…
The first photometric analysis and period investigation of the K-type W UMa type binary system V0842 Cep
Li, Kai; Liu, Yuan; Li, Yu-Yang
V0842 Cep is a W UMa-type binary star that has been neglected since its discovery. We analysed the VRcIc light curves, obtained by the 1 m telescope at Weihai Observatory of Shandong University, using the Wilson-Devinney code. V0842 Cep was found to be a shallow contact binary system (f = 8.7%) with a mass ratio of 2.281. Bec…
SN 2019hcc: a Type II supernova displaying early O II lines
Gromadzki, Mariusz; Pignata, Giuliano; Galbany, Lluis +18 more
We present optical spectroscopy together with ultraviolet, optical, and near-infrared photometry of SN 2019hcc, which resides in a host galaxy at redshift 0.044, displaying a sub-solar metallicity. The supernova spectrum near peak epoch shows a 'w' shape at around 4000 Å which is usually associated with O II lines and is typical of Type I superlum…
Mapping a duck: geological features and region definitions on comet 67P/Churyumov-Gerasimenko
Küppers, M.; Besse, S.; Grieger, B. +1 more
The data from the Rosetta mission have permitted a reconstruction of the shape of comet 67P/Churyumov-Gerasimenko and an identification of the terrains and features forming the surface. The peculiar shape of the comet has made it challenging to project these geological features onto an unambiguous frame. As a result, the geological maps published …
AGB and RGB stars in the dwarf irregular galaxy Leo A
Stonkutė, Rima; Vansevičius, Vladas; Leščinskaitė, Alina
Context. Leo A is a gas-rich dwarf irregular galaxy of low stellar mass located in the outskirts of the Local Group. It has an extended star formation history with stellar populations spanning a wide age range (∼0.01−10 Gyr). As Leo A is a well-isolated dwarf galaxy, it is a perfect target to study a galactic structure formed entirely by processes…