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An Incipient Debris Disk in the Chamaeleon I Cloud
Hernández, J.; Ribas, Á.; McClure, M. K. +5 more
The point at which a protoplanetary disk becomes a debris disk is difficult to identify. To better understand this, here we study the ∼40 au separation binary T 54 in the Chamaeleon I cloud. We derive a K5 spectral type for T 54 A (which dominates the emission of the system) and an age of ∼2 Myr. However, the dust disk properties of T 54 are consi…
High-resolution X-Ray Spectroscopy of the Seyfert 1 Galaxy Mrk 1040. Revealing the Failed Nuclear Wind with Chandra
Behar, E.; Turner, T. J.; Kraemer, S. B. +6 more
High-resolution X-ray spectroscopy of the warm absorber in the nearby X-ray bright Seyfert 1 galaxy Mrk 1040 is presented. The observations were carried out in the 2013-2014 timeframe using the Chandra High Energy Transmission Grating with a total exposure of 200 ks. A multitude of absorption lines from Ne, Mg, and Si are detected from a wide vari…
Surface brightness correction for compact extended sources observed by the AKARI Far-Infrared Surveyor in the slow-scan mode
Shirahata, Mai; Yamamura, Issei; Takita, Satoshi +5 more
We present a general surface brightness correction method for compact extended sources imaged in the slow-scan pointed observation mode of the Far-Infrared Surveyor (FIS) aboard the AKARI infrared astronomical satellite. Our method recovers correct surface brightness distribution maps by rescaling archived raw FIS maps using the surface-brightness…
Chandra imaging of the kpc extended outflow in 1H 0419-577
Kaastra, J. S.; Costantini, E.; Mehdipour, M. +3 more
The Seyfert 1 galaxy 1H 0419-577 hosts a kpc extended outflow that is evident in the [O III] image and that is also detected as a warm absorber in the UV/X-ray spectrum. Here, we analyze a 30 ks Chandra-ACIS X-ray image, with the aim of resolving the diffuse extranuclear X-ray emission and of investigating its relationship with the galactic outflo…
X-ray variability of cool stars: Magnetic activity and accretion
Stelzer, B.
This article provides a review of X-ray variability from late-type stars with particular focus on the achievements of XMM-Newton and its potential for future studies in this field.
Statistical imprints of CMB B-type polarization leakage in an incomplete sky survey analysis
Wang, Kai; Santos, Larissa; Zhao, Wen +2 more
One of the main goals of modern cosmology is to search for primordial gravitational waves by looking on their imprints in the B-type polarization in the cosmic microwave background radiation. However, this signal is contaminated by various sources, including cosmic weak lensing, foreground radiations, instrumental noises, as well as the E-to-B lea…
New Horizons Upper Limits on O2 in Pluto’s Present Day Atmosphere
Stern, S. A.; Olkin, C. B.; Weaver, H. A. +7 more
The surprising discovery by the Rosetta spacecraft of molecular oxygen (O2) in the coma of comet 67P/Churyumov-Gerasimenko challenged our understanding of the inventory of this volatile species on and inside bodies from the Kuiper Belt. That discovery motivated our search for oxygen in the atmosphere of Kuiper Belt planet Pluto, because…
High-resolution spectroscopy and abundance analysis of δ Scuti stars near the γ Doradus instability strip
Kambe, E.; Niemczura, E.; Molenda-Żakowicz, J. +5 more
δ Scuti stars are remarkable objects for asteroseismology. In spite of decades of investigations, there are still important questions about these pulsating stars to be answered, such as their positions in log Teff-log g diagram, or the dependence of the pulsation modes on atmospheric parameters and rotation. Therefore, we performed a de…
JVLA Observations of IC 342: Probing Star Formation in the Nucleus
Goss, W. M.; Johnson, K. E.; Kepley, Amanda A. +2 more
IC 342 is a nearby, late-type spiral galaxy with a young nuclear star cluster surrounded by several giant molecular clouds. The IC 342 nuclear region is similar to the Milky Way and therefore provides an interesting comparison. We explore star formation in the nucleus using radio recombination line (RRL) and continuum emission at 5, 6.7, 33, and 3…
New eruptive variable in the massive star-forming region associated with IRAS 18507+0121
Nikoghosyan, E. H.; Azatyan, N. M.; Khachatryan, K. G.
Aims: We report the discovery of a strong outburst of the embedded young stellar object (YSO) UKIDSS-J185318.36+012454.5, located in the star-forming region associated with IRAS 18507+0121 and the ultra-compact H II region GAL 034.4+00.23.
Methods: Using archival photometric data and images, we determined the amplitude and the epoch of t…