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KIC 4762887: A near-contact binary or an ellipsoidal variable star?
Liu, Liang; Li, Xu-Zhi
KIC 4762887 is a variable star with a very small amplitude discovered by Kepler and show the EW-type light curve. We analyzed the light curve of KIC 4762887 by using the 2015 version of the Wilson-Devinney code. The results indicated that it is not a contact binary, maybe not even an eclipsing binary. We also modelled the light curve by the Fourie…
Confirmation of seven faint ATLAS variable star candidates
Thomas, N.; Guan, C.
A pilot survey conducted at the Lookout Observatory has confirmed seven faint (V ~ 13 to 17) variables in the region of Kepler-76b that were recently discovered by the Asteroid Terrestrial-Impact Last Alert System (ATLAS). The ATLAS survey identified 315,000 probably variables within its wide-field survey in 2018. The faintness (down to r ~ 18) an…
Jovian electrons at the Earth orbit and stationary structures in the solar wind
Kecskeméty, K.; Daibog, E. I.; Logachev, Yu I.
This work studies the influence of the structure of inner heliospheric magnetic field on the propagation of Jovian electrons from Jupiter to the Earth orbit. Beginning from 1974, 13-month variations of relativistic Jovian electron fluxes were recorded by spacecraft near the Earth. 22 synodic cycles are analysed. The best connection in each cycle w…
Exploiting night-time averaged spectra from PFS/MEX shortwave channel. Part 1: Temperature retrieval from the CO2ν3 band
Vandaele, Ann Carine; Daerden, Frank; Nardi, Luca +7 more
Nadir remote sensing of the night side of Mars is challenging, mainly due to the low signal-to-noise ratio of such observations. We show in a companion paper that the abundance of carbon monoxide (CO) during night can be retrieved from the observations of the Planetary Fourier Spectrometer (PFS). This requires, however, an accurate knowledge of th…
The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution
Schlaufman, Kevin C.; Halpern, Noah D.
Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the low-occurrence, short-period planets sculpted by atmospheric escape ordinarily used to calibrate mass-radius relations and planet formation models. An…
Discovery of galaxy clusters and a head-tail radio galaxy in the direction of globular cluster NGC 6752
Wang, Wei; Li, Zhiyuan; Cheng, Zhongqun +1 more
We report on the discovery of CXOU J191100-595621 and CXOU J191012-595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archival Chandra observations with a total exposure time of ~344 ks. The deep Chandra X-ray data enabled us to measure the properties of both systems. We found a redshift of…
Nature and Variability of the Electron Velocity Distribution Functions and the Nonequilibrium Boltzmann Entropy in the Solar Wind at the First Lagrangian (L1) Point During the Halo CME Event on 25 July 2004
Nampoothiri, Govind G.; Thampi, R. Satheesh; Thampi, Smitha V. +2 more
In this paper, using the measurements at the Sun-Earth first Lagrangian point (L1), the kinetic properties of the electron velocity distribution functions (EVDFs) during the passage of a typical halo coronal mass ejection (CME) has been analyzed. This CME was a front-sided, full halo CME, which erupted on 25 July 2004 (Carrington rotation 2019) fr…
Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite Mission
Ganga, Ken; Remazeilles, Mathieu; Maris, Michele +1 more
As ever-more sensitive experiments are made in the quest for primordial CMB B Modes, the number of potentially significant astrophysical contaminants becomes larger as well. Thermal emission from interplanetary dust, for example, has been detected by the Planck satellite. While the polarization fraction of this Zodiacal, or interplanetary dust emi…
Speckle Interferometry at the OAN-SPM México: Multiband Astrometry of Double Stars Measured in 2018 and 2019
Guerrero, C. A.; Fernandes, M. Borges; Reyes-Ruiz, M. +9 more
In this paper we present multiband speckle interferometric measurements of double stars performed at the 2.1 m telescope of the Observatorio Astronómico Nacional, San Pedro Mártir, México. We focused our efforts on objects from the Washington Double Star Catalog that were observed during five runs allocated in 2018 and 2019. We report here 2101 as…
High-latitude cold ion outflow inferred from the Cluster wake observations in the magnetotail lobes and the polar cap region
André, Mats; Li, Kun; Wei, Yong +3 more
Cold ions with low (a few eV) thermal energies and also often low bulk drift energies, dominate the ion population in the Earth's magnetosphere. These ions mainly originate from the ionosphere. Here we concentrate on cold ions in the high latitude polar regions, where magnetic field lines are open and connected to the magnetotail. Outflow from the…