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Blast from the past: constraining progenitor models of SN 1972E
Schweizer, François; Shappee, Benjamin J.; Tonry, John L. +7 more
We present a novel technique to study Type Ia supernovae (SNe Ia) by constraining surviving companions of historical extragalactic SN by combining archival photographic plates and Hubble Space Telescope(HST) imaging. We demonstrate this technique for Supernova 1972E, the nearest known SN Ia in 125 yr. Some models of SNe Ia describe a white dwarf w…
Gaia DR2 giants in the Galactic dust - II. Application of the reddening maps and models
Gontcharov, George A.; Mosenkov, Aleksandr V.
We exploit a complete sample of 101 810 Gaia DR2 giants, selected in Paper I in the space cylinder with a radius of 700 pc around the Sun and a height of |Z| = 1800 pc, using the Gaia DR2 parallaxes, GBP and GRP photometry, and WISE W3 photometry. We explain the spatial variations of the modes of the observables GBP
Asteroseismology of RRab variable star EZ Cnc from K2 photometry and LAMOST spectroscopy
Zong, Weikai; Fu, Jian-Ning; Wang, Jiaxin +2 more
EZ Cnc, or EPIC 212182292, is a non-Blažko RRab variable star located in the field of K2 Campaign 16. Its atmospheric parameters (Teff, log g, [M/H]) and radial velocities are measured from the 55 high-quality LAMOST medium-resolution spectra. The fundamental frequency of pulsation is derived as f = 1.8323(17) d-1 from the K2…
Magnetic Reconnection Within the Boundary Layer of a Magnetic Cloud in the Solar Wind
Nakamura, Rumi; Narita, Yasuhito; Vörös, Zoltán. +5 more
The twisted local magnetic field at the front or rear regions of the magnetic clouds (MCs) associated with interplanetary coronal mass ejections (ICMEs) is often nearly opposite to the direction of the ambient interplanetary magnetic field. There is also observational evidence for magnetic reconnection (MR) outflows occurring within the boundary l…
Multiepoch Optical Images of IRC+10216 Tell about the Central Star and the Adjacent Environment
Ohyama, Youichi; Ueta, Toshiya; Lee, Ho-Gyu +5 more
Six images of IRC+10216 taken by the Hubble Space Telescope at three epochs in 2001, 2011, and 2016 are compared in the rest frame of the central carbon star. An accurate astrometry has been achieved with the help of Gaia Data Release 2. The positions of the carbon star in the individual epochs are determined using its known proper motion, definin…
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
Aigrain, S.; Stassun, K.; Barragán, O. +37 more
We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25…
The Sejong Open Cluster Survey (SOS). VII. A Photometric Study of the Young Open Cluster IC 1590
Lim, Beomdu; Bessell, Michael S.; Sung, Hwankyung +2 more
Young open clusters are ideal laboratories to understand the star formation process. We present deep UBVI and Hα photometry for the young open cluster IC 1590 in the center of the H II region NGC 281. Early-type members are selected from UBV photometric diagrams, and low-mass pre-main-sequence (PMS) members are identified by using Hα photometry. I…
A General Algorithm for the Linear and Quadratic Gradients of Physical Quantities Based on 10 or More Point Measurements
Dunlop, M.; Shen, Chao; Pu, Zuyin +3 more
A novel algorithm for estimating both the linear and quadratic gradients of physical quantities based on multiple spacecraft observations using the least squares method is put forward. Using 10 or more spacecraft constellation measurements as input, this new algorithm can yield both the linear and quadratic gradients at the barycenter of the const…
Can the Fe K-alpha Line Reliably Predict Supernova Remnant Progenitors?
Frank, Kari A.; Burrows, David N.; Dwarkadas, Vikram V. +1 more
The centroid energy of the Fe Kα line has been used to identify the progenitors of supernova remnants (SNRs). These investigations generally considered the energy of the centroid derived from the spectrum of the entire remnant. Here we use XMM-Newton data to investigate the Fe Kα centroid in 6 SNRs: 3C 397, N132D, W49B, DEM L71, 1E 0102.2-7219, an…
Simultaneous sublimation activity of primitive asteroids including (24) Themis and (449) Hamburga: Spectral signs of an exosphere and the solar activity impact
Petrova, Elena V.; Busarev, Vladimir V.; Irsmambetova, Tatiana R. +2 more
We describe and analyze simultaneous sublimation activity of the main-belt primitive asteroids during their perihelion passages, which was detected by spectral methods. This phenomenon was observed for the first time in September 2012 for asteroids (145) Adeona, (704) Interamnia, (779) Nina, and Mars-crosser (1474) Beira (Busarev et al., 2015, 201…