Search Publications
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…
Comparison of LOS Doppler Velocities and Non-Thermal Line Widths in the Off-Limb Solar Corona Measured Simultaneously by CoMP and Ninode/EIS
Lee, Kyoung-Sun; Cho, Kyung-Suk; Lee, Jae-Ok +1 more
Observations of line of sight (LOS) Doppler velocity and non-thermal line width in the off-limb solar corona are often used for investigating the Alfvén wave signatures in the corona. In this study, we compare LOS Doppler velocities and non-thermal line widths obtained simultaneously from two different instruments, Coronal Multichannel Polarimeter…
Dust devils: Characteristics of the forward motion from a Saharan survey
Esposito, Francesca; Ruggeri, Alan Cosimo; Silvestro, Simone +6 more
Dust devils have been proposed as a tool to investigate martian near-ground wind conditions. However, further studies are needed in order to fully understand how background atmospheric conditions affect dust devil forward motion. One of the main issues is related to the lack of synchronous acquisition of the dust devils forward speed and ambient w…
Predicting far-infrared maps of galaxies via machine learning techniques
Baes, Maarten; Dobbels, Wouter
Context. The ultraviolet (UV) to sub-millimetre spectral energy distribution of galaxies can be roughly divided into two sections: the stellar emission (attenuated by dust) at UV to near-infrared wavelengths and dust emission at longer wavelengths. In Dobbels et al. (2020, A&A, 634, A57), we show that these two sections are strongly related, a…
The Stellar Content of H72.97-69.39, a Potential Super Star Cluster in the Making
Hirschauer, Alec S.; Meixner, Margaret; Zinnecker, Hans +2 more
Young massive clusters and super star clusters (SSCs) represent an extreme mode of star formation. Far-infrared imaging of the Magellanic Clouds has identified one potential embedded SSC, HSO BMHERICC J72.971176-69.391112 (H72.97-69.39 in short), in the southwest outskirts of the Large Magellanic Cloud. We present Gemini Flamingos 2 and GSAOI near…