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Evolution from Spherical AGB Wind to Multipolar Outflow in Pre-planetary Nebula IRAS 17150-3224
Lee, Chin-Fei; Sahai, Raghvendra; Huang, Po-Sheng
We have mapped the pre-planetary nebula IRAS 17150-3224 in the 350 GHz continuum and CO J = 3-2 line at an angular resolution of ∼0"09 using the Atacama Large Millimeter/submillimeter Array. A continuum source is detected at the center of the nebula, elongated along the equatorial plane, likely tracing a dusty torus around the central source. Cont…
Global parameters of the W UMa binaries NSVS 3777464, NSVS 5810460 and ASAS J212236+0657.3
Petrov, N.; Kjurkchieva, D.; Popov, V. +1 more
Photometric observations in Sloan filters g', i' of the short-period eclipsing stars NSVS 3777464, NSVS 5810460 and ASAS J212236+0657.3 are presented. Their goal was determination of the targets' parameters by light curve solutions. We found the three targets to be overcontact binaries of W subtype: NSVS 3777464 and NSVS 5810460 undergo partial ec…
The highly inflated giant planet WASP-174b
Henning, Th.; Southworth, J.; Chen, G. +18 more
Context. The transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star (V = 11.8 mag) and a giant planet, WASP-174b (orbital period Porb = 4.23 days). However only an upper limit was placed on the planet mass (<1.3 MJup), and a highly uncertain planetary radius (0.7-1.7 RJup) …
X-Ray Hotspots in the Northwest Shell of the Supernova Remnant RX J1713.7-3946
Uchiyama, Yasunobu; Tsuji, Naomi; Higurashi, Ryota
The supernova remnant (SNR) RX J1713.7-3946 is one of the best-studied accelerators of cosmic rays because of its strong nonthermal X-ray and gamma-ray radiation. We have analyzed accumulated Chandra observations with a total exposure time of ∼266 ks in the northwest rim of RX J1713.7-3946. We detect a substantially large number of point-like sour…
Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
Fossati, L.; Skarka, M.; Krtička, J. +6 more
Context. Ultraprecise space photometry enables us to reveal light variability even in stars that were previously deemed constant. A large group of such stars show variations that may be rotationally modulated. This type of light variability is of special interest because it provides precise estimates of rotational rates.
Aims: We aim to under…
A Newtonian Model for the WASP-148 Exoplanetary System Enhanced with TESS and Ground-based Photometric Observations
Fernández, M.; Maciejewski, G.; Sota, A. +1 more
The WASP-148 planetary system has a rare architecture with a transiting Saturn-mass planet on a tight orbit which is accompanied by a slightly more massive planet on a nearby outer orbit. Using new space-born photometry and ground-based follow-up transit observations and data available in literature, we performed modeling that accounts for gravita…
Unveiling Vela - variability of interstellar lines in the direction of the Vela supernova remnant - III. Na D and Ca II K
Muneer, S.; Lambert, David L.; Reddy, Arumalla B. S. +4 more
High-resolution optical spectra were obtained in 2017-2019 with The Southern African Large Telescope of 15 stars in the direction of the Vela supernova remnant. Interstellar Ca II H & K and Na I D lines are discussed in this paper. In particular, the line profiles are compared with profiles at a comparable spectral resolution obtained in 1993-…
Investigation of target property effects on crater populations in long lava flows: A study in the Cerberus region, Mars, with implications for magma source identification
Burr, Devon M.; Kattenhorn, Simon A.; Golder, Keenan B.
Young volcanism on Mars is exemplified within the Cerberus region, which enables examination of relatively pristine lava flow surfaces. In this investigation, we derived model ages within the circum-Cerberus channelized lavas for sites proximal, medial, and distal to the lava flow sources, finding that these ages decrease with increasing distance …
The detection of solid phosphorus and fluorine in the dust from the coma of comet 67P/Churyumov-Gerasimenko
Cottin, Hervé; Fray, Nicolas; Bardyn, Anaïs +8 more
Here, we report the detection of phosphorus and fluorine in solid particles collected from the inner coma of comet 67P/Churyumov-Gerasimenko measured with the COmetary Secondary Ion Mass Analyser (COSIMA) instrument on-board the Rosetta spacecraft, only a few kilometers away from the comet nucleus. We have detected phosphorus-containing minerals f…
A Catalog of Solar Flare Events Observed by the SOHO/EIT
Martens, Petrus C. H.; Rotti, Sumanth A.; Aydin, Berkay
We have compiled a catalog of solar flares (SFs) as observed by the Extreme ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) spacecraft and the Geostationary Operational Environmental Satellites (GOES) spacecraft over a span from 1997 to 2010. During mid-1998, the cadence of EIT images was revised from two…