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2023.12.22

The three regimes of atmospheric evaporation for super-Earths and sub-Neptunes

<p>A significant fraction of super-Earths and sub-Neptunes are thought to experience an extreme loss of volatiles because of atmospheric evaporation in the early stages of their life. Though the mechanisms behind the extreme mass loss are not fully understood, two contenders have been widely discussed: photoevaporation from X-ray and ultraviolet irradiation and core powered mass loss. In this talk...</p>

2023.12.15

Bridging the gap between luminous red novae and common envelope evolution with radiation hydrodynamic models

<p>Luminous red novae (LRNe) are relatively new transients that have the luminosity between classic novae and supernovae, initially classified as &quot;gap transients&quot;. Even though many more &quot;gap transients&quot; have been observed by telescopes such as ZTF and Keck, their origin and physical processes remain mysterious. To initiate the study of the nature of LRNe, I built a 1D and 2D radiation hydrodynamic...</p>

2023.12.01

The UV luminosity function at 0.6 < z < 1 from UVCANDELS

<p>UVCANDELS is a HST Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields: GOODS-N, GOODS-S, EGS, and COSMOS, covering a total area of ～426 arcmin^2. This is ～2.7 times larger than the area covered by previous deep-field space UV data combined, reaching a depth of about 27 and 28 ABmag (5 \si...</p>

2023.11.24

Directly detecting dark matter and neutron stars with gravitational waves

<p>The third observing run of advanced LIGO, Virgo and KAGRA brought unprecedented sensitivity towards a variety of quasi-monochromatic, persistent gravitational-wave signals. Continuous waves allow us to probe not just the canonical asymmetrically rotating neutron stars, but also different forms of dark matter, thus showing the wide-ranging astrophysical implications of using a relatively simple ...</p>

2023.11.17

Robust detection of the hot phase WHIM emission with eRASS

<p>The highly ionized warm/hot intergalactic medium (WHIM) permeating the vast space of the cosmic filaments is one of the least explored baryon contents in the local Universe. The properties of the WHIM in long cosmic filaments with lengths reaching up to 20-100Mpc, which account for &gt;80% of the total filament volume and 50% of the baryonic mass, remain to be explored. In this work, we examine th...</p>

2023.11.17

SRG/eROSITA Lockman Hole Survey: X-ray Sources Classification and Obscured AGN Candidates

<p>Lockman Hole field is an area in the sky with an extremely low column density of neutral hydrogen on the line of sight (Lockman et al., 1986). This outstanding characteristic turns Lockman Hole into a perfect window to observe extragalactic sources. The SRG/eROSITA space telescope conducted a deep X-ray survey in this area during the performance verification phase in 2019.My talk will be divide...</p>

2023.11.10

The binarity in massive star explosion -- A 12.4 day periodicity in a close binary system after a supernova

<p>Neutron stars and stellar-mass black holes are the remnants of massive star explosions. Most massive stars reside in close binary systems, but signatures for binarity or evidence &nbsp;for the formation of a compact object during a supernova explosion are still lacking. In this talk, I report the discovery of a stripped-envelope supernova, SN2022jli, which shows 12.4-day &nbsp;periodic undulations during...</p>

2023.11.03

Unprecedented insights into the formation and evolution of the Galactic disk.

<p>The Galactic disk contains a substantial fraction of the baryonic matter angular momentum and at least two main stellar populations. Therefore, the formation and evolution of the Galactic disk is essential for understanding how our Galaxy was formed and evolved. We used accurate photometric metallicity estimates and Gaia Early Data Release 3 astrometries and two independent techniques (velocity...</p>

2023.10.27

First-year JWST results of high-redshift moderate-luminosity AGN

<p>I present the latest results from a JWST Cycle 1 GO program, in which 12 of the lowest-luminosity z&gt;6 quasars selected from the deep Subaru/HSC survey are observed with NIRCam imaging and NIRSpec Fixed-Slit spectroscopy. We have successfully detected stellar light of quasar host galaxies in NIRCam F150W and F356W images, which straddle the redshifted 4000 angstrom break. A self-developed image ...</p>

2023.10.20

TRANSforM: stellar parameters estimated from LAMOST DR10 M dwarfs

<p>The accurate determination of stellar parameters in M-type stars holds significant importance in various astronomical studies. In our study, we employed a transfer learning method coupled with PHOENIX synthetic spectra to estimate fundamental atmospheric parameters (Teff, log g, [M/H], [α/M]) and radial velocities (RV) for an extensive dataset encompassing 581,778 M dwarfs obtained from the Lo...</p>