Search Publications
Optical Counterpart to the Ultraluminous X-Ray Source in the UGC 6456 Galaxy
Vinokurov, A.; Solovyeva, Y.; Atapin, K.
We report the identification of the optical counterpart to the transient ultraluminous X-ray source in the blue dwarf galaxy UGC 6456 (VII Zw 403). The source is highly variable in both the X-ray (by a factor of at least 100, 0.3-10 keV) and optical (by a factor of three, V-band) ranges. The peak X-ray luminosity of UGC 6456 ultraluminous X-ray so…
TESS observations of pulsating subdwarf B stars: extraordinarily short-period gravity modes in CD-28° 1974
Reed, M. D.; Jeffery, C. S.; Uzundag, M. +7 more
Transiting Exoplanet Survey Satellite (TESS) observations show CD-28° 1974 to be a gravity(g)-mode-dominated hybrid pulsating subdwarf B (sdBV) star. It shows 13 secure periods that form an ℓ = 1 asymptotic sequence near the typical period spacing. Extraordinarily, these periods lie between 1500 and 3300 s, whereas typical $\ell = 1\, g$ modes in …
A new method of determining brightness and size of cometary nuclei
Paradowski, Mieczyslaw Leszek
This paper presents a new method of determining the brightness and size of cometary nuclei that has been applied to the following 32 observed comets: 2P/Encke, 29P/Schwassmann-Wachmann 1, 102P/Shoemaker 1, 103P/Hartley 2, 168P/Hergenrother, 189P/NEAT, 260P/McNaught, 315P/LONEOS, P/2012 NJ (La Sagra), P/2013 J2 (McNaught), C/2006 S3 (LONEOS), C/200…
Synthetic Tracking Using ZTF Deep Drilling Data Sets
Rusholme, Ben; Bellm, Eric C.; Graham, Matthew J. +15 more
The Zwicky Transit Facility (ZTF) is a powerful time domain survey telescope with a large field of view of 47 ${\deg }^{2}$ deg 2 . We apply the synthetic tracking technique to integrate a ZTF's deep drilling data set, which consists of 133 nominal 30 s exposure frames spanning about 1.5 hr, to search for slowly moving asteroids down to approximat…
The GAPS programme at TNG. XXIV. An eccentric Neptune-mass planet near the inner edge of the BD-11 4672 habitable zone
Scandariato, G.; Pagano, I.; Poretti, E. +34 more
Context. With the growth of comparative exoplanetology, it is becoming increasingly clear that investigating the relationships between inner and outer planets plays a key role in discriminating between competing formation and evolution models. To do so, it is important to probe the inner region of systems that host long-period giants in search of …
Variability of Massive Stars in M31 from the Palomar Transient Factory
Drout, Maria R.; Kulkarni, Shrinivas R.; Kupfer, Thomas +5 more
Using data from the (intermediate) Palomar Transient Factory (iPTF), we characterize the time variability of ≈500 massive stars in M31. Our sample is those stars that are spectrally typed by Massey and collaborators, including Luminous Blue Variables, Wolf-Rayets, and warm and cool supergiants. We use the high-cadence, long-baseline (≈5 yr) data f…
RGS Observations of Ejecta Knots in Tycho's Supernova Remnant
Katsuda, Satoru; Petre, Robert; Uchida, Hiroyuki +3 more
We present results from XMM-Newton/Reflection Grating Spectrometer (RGS) observations of prominent knots in the southernmost portion of Tycho's supernova remnant, known to be the remnant of a Type Ia supernova in 1572 C.E. By dispersing the photons from these knots out of the remnant with very little emission in front of or behind them, we obtaine…
Distance to the Energetic Neutral Hydrogen Source from the Heliotail
McComas, D. J.; Dayeh, M. A.; Sokół, J. M. +1 more
The interaction of the solar wind (SW) with the partially ionized interstellar medium forms the heliosphere. As the supersonic SW flows away from the Sun and incorporates pickup ions (PUIs), they are slowed, compressed, and heated at a termination shock, creating an energetic ion population in the inner heliosheath. The neutralization of PUIs in t…
From the inner to outer Milky Way: a photometric sample of 2.6 million red clump stars
Ting, Yuan-Sen; Hawkins, Keith; Lucey, Madeline +1 more
Large pristine samples of red clump stars are highly sought after given that they are standard candles and give precise distances even at large distances. However, it is difficult to cleanly select red clumps stars because they can have the same Teff and log g as red giant branch stars. Recently, it was shown that the asteroseismic para…
NGC 7538 IRS1—an O Star Driving an Ionized Jet and Giant N-S Outflow
Wiesemeyer, Helmut; Güsten, Rolf; Sandell, Göran +4 more
NGC 7538 IRS 1 is a very young embedded O star driving an ionized jet and accreting mass with an accretion rate >10-4 ${M}_{\odot }$ yr-1, which is quenching the hypercompact H II region. We use SOFIA GREAT data, Herschel PACS and SPIRE archive data, SOFIA FORCAST archive data, Onsala 20 m and CARMA data, and JCMT archive …