Search Publications
Solar irradiance, climatic indicators and climate change - An empirical analysis
Singh, A. K.; Bhargawa, Asheesh
Since the Sun is the main source of energy for our planet therefore even a slight change in its output energy can make a huge difference in the climatic conditions of the terrestrial environment. The rate of energy coming from the Sun (solar irradiance) might affect our climate directly by changing the rate of solar heating of the Earth and the at…
Hazes and clouds in a singular triple vortex in Saturn's atmosphere from HST/WFC3 multispectral imaging
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Irwin, Patrick G. J. +2 more
In this paper we present a study of the vertical haze and cloud structure over a triple vortex in Saturn's atmosphere in the planetographic latitude range 55°N-69°N (del Río-Gaztelurrutia et al., 2018) using HST/WFC3 multispectral imaging. The observations were taken during 29-30 June and 1 July 2015 at ten different filters covering spectral rang…
A Search for Analogs of KIC 8462852 (Boyajian’s Star): A Proof of Concept and the First Candidates
Schmidt, Edward G.
The seemingly normal F dwarf, KIC 8462852 (a.k.a. Boyajian’s Star), has been observed to exhibit two types of behavior unique among known variable stars: infrequent episodes of small brightness dips and a long-term decline in brightness between the dips. No satisfactory mechanism has been found for this behavior, at least in part, because there is…
Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20
Robinson, Andrew; Fischer, Travis C.; Schnorr-Müller, Allan +14 more
We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) at a spatial resolution of 250 pc and spectral resolution of 36 km s-1. Strong [O III], Hα, [N II] and [S …
Star Clusters in the Elliptical Galaxy NGC 4589 Hosting a Calcium-rich SN Ib (SN 2005cz)
Lee, Myung Gyoon; Kang, Jisu; Jang, In Sung
NGC 4589, a bright E2 merger-remnant galaxy, hosts the peculiar fast and faint calcium-rich SN Ib SN 2005cz. The progenitor of Ca-rich SNe Ib has been controversial: it could be (1) a young, massive star with 6-12 M ⊙ in a binary system, or (2) an old, low-mass star in a binary system that was kicked out from the galaxy center. Moreover…
Novel methods to measure the gravitational constant in space
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a displaced source mass. Experiment 2 measures a change in relative acceleration between two test masses due to a s…
Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138
Ábrahám, P.; Chen, L.; Varga, J. +3 more
We studied the disc of the unclassified B[e] star HD 50138 in order to explore its structure and to find indications for the evolutionary status of this system, whether it is a young Herbig Be or a post-main-sequence star. Using high spatial resolution interferometric measurements from MIDI instrument (N-band) on the Very Large Telescope Interfero…
Acoustic oscillations and dynamo action in the G8 sub-giant EK Eridani
Pallé, P. L.; Stello, D.; Corsaro, E. +3 more
We present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG telescope at the Observatorio del Teide for two different runs of 8 and 13 nights, respectively, that were separated by about a year. We determined a significant excess of power around ν
Retrieval and characterization of carbon monoxide (CO) vertical profiles in the Martian atmosphere from observations of PFS/MEX
Vandaele, Ann Carine; Aoki, Shohei; Daerden, Frank +7 more
The knowledge of the carbon monoxide (CO) abundance on Mars is essential in order to assess the processes driving the carbon cycle on the planet. Solar occultation measurements provide vertically-resolved measurements of CO from a few kilometers to higher altitudes and can be complemented by nadir measurements to enhance the spatial coverage of ob…
A Mini Survey of Methyl Cyanide toward Extended Green Objects
Liu, Sheng-Yuan; Chen, Huei-Ru; Su, Yu-Nung +4 more
We present results of a survey of methyl cyanide (CH3CN) J = 12-11 toward 56 sources, including 35 Extended Green Objects (EGOs) and 21 nearby AKARI counterparts, with the Submillimeter Telescope (SMT) in order to characterize the nature of EGOs. CH3CN, a tracer of hot core emission, is detected in 19 EGOs (∼54%) and five AKA…