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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…
The GOGREEN Survey: Evidence of an Excess of Quiescent Disks in Clusters at 1.0
Cooper, M. C.; Muzzin, Adam; Forrest, Ben +21 more
We present the results of the measured shapes of 832 galaxies in 11 galaxy clusters at 1.0 < z < 1.4 from the GOGREEN survey. We measure the axis ratio (q), the ratio of the minor to the major axis, of the cluster galaxies from near-infrared Hubble Space Telescope imaging using Sérsic profile fitting and compare them with a field sample. We …
Constraints on planets in nearby young moving groups detectable by high-contrast imaging and Gaia astrometry
Federrath, C.; Ireland, M. J.; Wallace, A. L.
The formation of giant planets can be studied through direct imaging by observing planets both during and after formation. Giant planets are expected to form either by core accretion, which is typically associated with low initial entropy (cold-start models) or by gravitational instability, associated with high initial entropy of the gas (hot-star…
Measuring Stellar Masses of Emission-line Galaxies at 1.2 < z < 1.9
Yang, Guang; Gronwall, Caryl; Ciardullo, Robin +4 more
The accurate measurement of stellar masses over a wide range of galaxy properties is essential for better constraining models of galaxy evolution. Emission-line galaxies (ELGs) tend to have better redshift estimates than continuum-selected objects, and have been shown to span a large range of physical properties, including stellar mass. Using data…
Where Do Obscured AGN Fit in a Galaxy's Timeline?
Giavalisco, Mauro; Kirkpatrick, Allison; Ji, Zhiyuan +7 more
Many X-ray bright active galactic nuclei (AGNs) are predicted to follow an extended stage of obscured black hole growth. In support of this picture we examine the X-ray undetected AGNs in the COSMOS field and compare their host galaxies with X-ray bright AGNs. We examine galaxies with M* > 109.5 M⊙ for the prese…