Search Publications
Exploring faint white dwarfs and the luminosity function with Subaru HSC and SDSS in Stripe 82
Takada, Masahiro; Kashiyama, Kazumi; Yasuda, Naoki +4 more
We present 5080 white dwarf (WD) candidates selected from stars matching between the multiband imaging data sets of the Subaru Hyper Suprime-Cam (HSC) Survey and the Sloan Digital Sky Survey in the Stripe82 region covering about 165 deg
TOI-3568 b: A super-Neptune in the sub-Jovian desert
Moutou, C.; Carmona, A.; Donati, J. -F. +42 more
The sub-Jovian desert is a region in the mass-period and radius-period parameter space that typically encompasses short-period ranges between super-Earths and hot Jupiters, and exhibits an intrinsic dearth of planets. This scarcity is likely shaped by photoevaporation caused by the stellar irradiation received by giant planets that have migrated i…
Do All the Quasars and High-excitation Radio Galaxies (HERGs) in the 3CRR Catalog Contain a Magnetically Arrested Disk (MAD)?
Li, Shuang-Liang; Cao, Xinwu; Zuo, Wenwen
Based on the magnetization, an accretion disk with a large-scale magnetic field can be separated into either standard and normal evolution or magnetically arrested disk (MAD), which are difficult to identify from observations. It is still unclear whether all the radio-loud active galactic nuclei (RLAGNs) with a thin disk and strong radio emissions…
Spectroscopic evidence of a possible young stellar cluster at the Galactic Center
Najarro, F.; Nogueras-Lara, F.; Schödel, R. +3 more
Context. The nuclear stellar disk has been the most prolific star-forming region in the Milky Way over the past ∼30 million years. Notably, the cumulative mass of the three clusters currently found in the nuclear stellar disk, the Quintuplet, the Arches, and the Nuclear clusters, amounts to just 10% of the total anticipated mass of young stars tha…
A Massive White Dwarf or Low-mass Neutron Star Discovered by LAMOST
Liu, Jifeng; Wang, Song; Zhao, Xinlin +3 more
We report the discovery of a close binary J0606+2132 (Gaia DR3 3423365496448406272) with P obs = 2.77 days containing a possible massive white dwarf (WD) or a neutron star (NS) using LAMOST spectroscopic data. By a joint fitting of the radial velocity from LAMOST and the light curve from TESS, we derived a circular Keplerian orbit with …
A Search for Collisions and Planet–Disk Interactions in the Beta Pictoris Disk with 26 Years of High-precision HST/STIS Imaging
Stark, Christopher C.; Wagner, Kevin; Apai, Dániel +2 more
β Pictoris's well-studied debris disk and two known giant planets, in combination with the stability of the Hubble Space Telescope's Space Telescope Imaging Spectrograph (HST/STIS) (and now also JWST), offers a unique opportunity to test planet–disk interaction models and to observe recent planetesimal collisions. We present HST/STIS coronagraphic…
Finite Element Analysis of Electrostatic Coupling in LISA Pathfinder Inertial Sensors
Zhang, Wenyan; Lei, Jungang; Wang, Zuolei +4 more
In the LISA Pathfinder (LPF) mission, electrostatic noise can reach the femto-Newtonian level despite the fact that the LPF's sensors are equipped with potential shielding. Most of the existing simulation studies focus on the electrostatic edge effect and related fields, while the simulation study of the patch effect is neglected. For that reason,…
Charge sign dependence of recurrent Forbush decreases in 2016–2017
Heber, B.; Romaneehsen, L.; Marquardt, J.
Context. This study investigates the periodicities of galactic cosmic ray flux attributed to corotating interaction regions (CIRs) using Alpha Magnetic Spectrometer (AMS-02) data from late 2016 to early 2017. Aims. We determine the rigidity dependence of recurrent Forbush decrease (RFD) amplitudes induced by CIRs for different particles with a foc…
Spectro-photometry of Phobos simulants: I. Detectability of hydrated minerals and organic bands
Hasselmann, Pedro H.; Poggiali, Giovanni; Fornasier, Sonia +12 more
Previous Mars Reconnaissance Orbiter and Mars Express observations of Phobos and Deimos, the moons of Mars, have improved our understanding of these small bodies. However, their formation and composition remain poorly constrained. Physical and spectral properties suggest that Phobos may be a weakly thermal-altered captured asteroid but the dynamic…
Self-absorption in solar surge as observed by IRIS
Kayshap, Pradeep; Babu, B. Suresh; Tripathi, Sharad C.
Solar surges are collimated flows of plasma that occur in the periphery of active regions (ARs). The kinematics, physical properties, and triggering mechanisms of a solar surge were studied through imaging and spectroscopic diagnosis. The surge has a typical inverted Y-shape, and it moves with a speed of more than 200 km/s in the transition-region…