Search Publications
Local-time Dependence of Chemical Species in the Venusian Mesosphere
Shao, Wencheng D.; Zhang, Xi; Mendonça, João +1 more
Observed chemical species in the Venusian mesosphere show local-time variabilities. SO2 at the cloud top exhibits two local maxima over local time, H2O at the cloud top is uniformly distributed, and CO in the upper atmosphere shows a statistical difference between the two terminators. In this study, we investigated these loca…
Substellar Hyades Candidates from the UKIRT Hemisphere Survey
Cushing, Michael C.; Schneider, Adam C.; Faherty, Jacqueline K. +14 more
We have used data from the UKIRT Hemisphere Survey to search for substellar members of the Hyades cluster. Our search recovered several known substellar Hyades members, and two known brown dwarfs that we suggest may be members based on a new kinematic analysis. We uncovered thirteen new substellar Hyades candidates, and obtained near-infrared foll…
Searching for giant planets in the outer Solar system with far-infrared all-sky surveys
Serjeant, Stephen; Sedgwick, Chris
We have explored a method for finding giant planets in the outer Solar system by detecting their thermal emission and proper motion between two far-infrared all-sky surveys separated by 23.4 yr, taken with the InfraRed Astronomical Satellite (IRAS) and the AKARI Space Telescope. An upper distance limit of about 8000 AU is given by both the sensiti…
Differential Proper Motion Spin of the Hipparcos and Gaia Celestial Reference Frames
Makarov, Valeri V.
The Hipparcos catalog provides the first epoch of the celestial reference frame (CRF) in the optical domain and serves as an indispensable tool to verify and improve the Gaia CRF for the brighter stars (V < 11 mag) and to identify the elusive astrometric binary stars with dim or invisible companions, including long-period exoplanets. The system…
SDSS-IV MaNGA: Identification and multiwavelength properties of Type-1 AGN in the DR15 sample
Negrete, C. A.; Hernández-Toledo, H. M.; Ibarra-Medel, H. +2 more
We present a method to identify type-1 active galactic nuclei (AGNs) in the central 3 arcsec integrated spectra of galaxies in the MaNGA DR15 sample. It is based on flux ratios estimates in spectral bands flanking the expected H α broad component H αBC. The high signal-to-noise ratio obtained (mean S/N = 84) permits the identification o…
Revising Properties of Planet-Host Binary Systems. II. Apparent Near-Earth-analog Planets in Binaries Are Often Sub-Neptunes
Kraus, Adam L.; Sullivan, Kendall
Identifying rocky planets in or near the habitable zones of their stars (near-Earth analogs) is one of the key motivations of many past and present planet-search missions. The census of near-Earth analogs is important because it informs calculations of the occurrence rate of Earth-like planets, which in turn feed into calculations of the yield of …
The changing-look AGN NGC 1566 in quiescence with XMM-Newton: a nuclear starburst and an AGN competing in power?
Santos-Lleó, M.; Ballo, L.; Jiménez Bailón, E. +8 more
Star formation accretion on to the super massive black holes (SMBHs) and feedback processes link the evolution of galaxies with their SMBHs. X-ray observations in the imaging and spectral regime have revealed to be an important tool to study the connection between nuclear activity and circumnuclear star formation in nearby active galactic nuclei (…
Transverse Oscillation of Coronal Loops Induced by Eruptions of a Magnetic Flux Tube and a Plasmoid
Maurya, Ram Ajor; Safna Banu, K.; Jain Jacob, P. T.
We studied transverse oscillations in hot coronal loops of active region NOAA 12673 located at the west limb. Loop oscillations were associated with a plasmoid ejection from the same location. During the rising phase of the plasmoid, a magnetic flux tube was seen to be rising and bending towards the loop system that erupted before the plasmoid eje…
Water emission tracing active star formation from the Milky Way to high-z galaxies
Kristensen, L. E.; Dutkowska, K. M.
Context. The question of how most stars in the Universe form remains open. While star formation predominantly takes place in young massive clusters, the current framework focuses on isolated star formation. This poses a problem when trying to constrain the initial stellar mass and the core mass functions, both in the local and distant Universe.
An EUV Jet Driven by a Series of Transition Region Microjets
Fu, Hui; Xia, Lidong; Huang, Zhenghua +5 more
Jets are one of the most common eruptive events in the solar atmosphere, and they are believed to be important in the context of coronal heating and solar wind acceleration. We present an observational study on a sequence of jets with the data acquired with the Solar Dynamics Observatory and the Interface Region Imaging Spectrograph. This sequence…