Search Publications
A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b
Tamura, M.; Pallé, E.; Korth, J. +45 more
Aims: We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods: We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contaminati…
Galaxy clustering in the VVV near-IR galaxy catalogue
Minniti, Dante; Alonso, M. Victoria; Valotto, Carlos +7 more
Mapping galaxies at low Galactic latitudes and determining their clustering status are fundamental steps in defining the large-scale structure in the nearby Universe. The VISTA Variables in the Vía Láctea (VVV) near-IR galaxy catalogue (VVV NIRGC) allows us to explore this region in great detail. Our goal is to identify galaxy overdensities and ch…
Ionospheric total electron content anomaly possibly associated with the April 4, 2010 Mw7.2 Baja California earthquake
Zhou, Chen; Liu, Jing; Wang, Wenbin +2 more
Identifying ionospheric disturbances potentially related to an earthquake is a challenging work. Based on the ionospheric total electron content (TEC) data from the madrigal database at the Haystack Observatory, Massachusetts Institute of Technology, a new decomposition and nonlinear fitting method has been developed and applied in this work to ex…
Identifying RR Lyrae in the ZTF DR3 data set
Koposov, Sergey E.; Huang, Kuan-Wei
We present an RR Lyrae (RRL) catalogue based on the combination of the third data release of the Zwicky Transient Facility (ZTF DR3) and Gaia EDR3. We use a multistep classification pipeline relying on the Fourier decomposition fitting to the multiband ZTF light curves and random forest classification. The resulting catalogue contains 71 755 RRLs …
Solar Polar Flux Redistribution Based on Observed Coronal Holes
Jones, Shaela I.; Arge, Charles N.; Henney, Carl J. +1 more
We explore the use of observed polar coronal holes (CHs) to constrain the flux distribution within the polar regions of global solar magnetic field maps in the absence of reliable quality polar field observations. Global magnetic maps, generated by the Air Force Data Assimilative Photospheric flux Transport (ADAPT) model, are modified to enforce f…
Estimating the Spin of the Black Hole Candidate MAXI J1659-152 with the X-Ray Continuum-fitting Method
Steiner, James F.; Gou, Lijun; Wu, Jianfeng +6 more
As a transient X-ray binary, MAXI J1659-152 contains a black hole candidate as its compact star. MAXI J1659-152 was discovered on 2010 September 25 during its only known outburst. Previously published studies of this outburst indicate that MAXI J1659-152 may have an extreme retrograde spin, which, if confirmed, would provide an important clue as t…
Searching for Cataclysmic Variable Stars in Unidentified X-Ray Sources
Takata, J.; Kong, A. K. H.; Hui, C. Y. +6 more
We carry out a photometric search for new cataclysmic variable stars (CVs), with the goal of identification for candidates of AR Scorpii-type binary systems. We select GAIA sources that are likely associated with unidentified X-ray sources, and analyze the light curves taken by the Zwicky Transient Facility, Transiting Exoplanet Survey Satellite, …
X-Ray and GeV-γ-Ray Emission Property of TeV Compact Symmetric Object PKS 1413+135 and Implication for Episodic Jet Activity
Liang, En-Wei; Yao, Su; Zhang, Hai-Ming +3 more
PKS 1413+135, a compact symmetric object (CSO) with a two-sided parsec-scale structure in its miniature radio morphology, is spatially associated with 4FGL J1416.1+1320 and recently detected with MAGIC telescopes. We comprehensively analyze its X-ray and gigaelectronvolt γ-ray observation data to reveal its high-energy radiation physics. It is fou…
Extended far-ultraviolet emission in distant dwarf galaxies
Gogoi, Rupjyoti; Saha, Kanak; Combes, Francoise +3 more
Blue compact dwarf (BCD) galaxies are low-luminosity (absolute K-band magnitude, MK > −21 mag)1, metal-poor (1/50 ≤ Z/Z⊙ ≤ 1/2, where Z is the metallicity in terms of the solar metallicity Z⊙)2, centrally concentrated3 galaxies with bright clumps of star formation4. Co…
Astrometric mass measurement of compact companions in binary systems with Gaia
Liu, Jifeng; Gao, Jian; Liao, Shilong +3 more
Context. For binary systems with an unseen primary and a luminous secondary, the astrometric wobble of the secondary could be used to study the primary. With Gaia, it is possible to measure the mass of the black hole or neutron star with a luminous companion (hereafter BH/NS-LC).
Aims: Our aim is to provide a method for predicting Gaia's abil…