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Exploring the dimming event of RW Aurigae A through multi-epoch VLT/X-shooter spectroscopy
Ray, T. P.; Coffey, D.; Natta, A. +6 more
Context. RW Aur A is a classical T Tauri star that has suddenly undergone three major dimming events since 2010. The reason for these dimming events is still not clear.
Aims: We aim to understand the dimming properties, examine accretion variability, and derive the physical properties of the inner disc traced by the CO ro-vibrational emission…
K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission
Kuzuhara, M.; Alonso, R.; Erikson, A. +40 more
We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V = 12.6 mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V = 12.6 mag G6V ([Fe/H] = + 0.10 ± 0.10) star in K2 campaign 10. Our…
Jupiter's auroral-related stratospheric heating and chemistry III: Abundances of C2H4, CH3C2H, C4H2 and C6H6 from Voyager-IRIS and Cassini-CIRS
Fletcher, L. N.; Irwin, P. G. J.; Orton, G. S. +4 more
We present an analysis of Voyager-1-IRIS and Cassini-CIRS spectra of Jupiter's high latitudes acquired during the spacecrafts' respective flybys in November 1979 and January 2001. We performed a forward-model analysis in order to derive the abundances of ethylene (C2H4), methylacetylene (CH3C2H), diacety…
High frequencies in TESS A-F main-sequence stars
Balona, L. A.; Cunha, M. S.; Holdsworth, D. L.
The driving mechanism for high-frequency oscillations in some chemically peculiar Ap stars, the rapidly oscillating Ap stars (roAp stars), is not understood. The Transiting Exoplanet Survey Satellite mission (TESS) data provide an ideal opportunity to extend the number of roAp stars that might provide further clues to address this problem. From an…
Spectroscopic study of two new super Li-rich red clump K giants
Reddy, Bacham E.; Kumar, Yerra Bharat; Singh, Raghubar
In this paper, we report the discovery of two new super Li-rich K giants: HD 24960 and TYC 1751-1713-1. Based on high-resolution (R ≈ 60 000) spectroscopy, we have derived Li abundance of A(Li) ≈ 4.0 dex for both stars. Other elemental abundances are normal of typical K giants. Low ratios of [C/N] ≤ -0.25 and 12C/13C ≤ 10 sug…
Overview of non-transient γ-ray binaries and prospects for the Cherenkov Telescope Array
Walter, R.; Sidoli, L.; La Palombara, N. +20 more
Aims: Despite recent progress in the field, there are still many open questions regarding γ-ray binaries. In this paper we provide an overview of non-transient γ-ray binaries and discuss how observations with the Cherenkov Telescope Array (CTA) will contribute to their study.
Methods: We simulated the spectral behaviour of the non-transi…
Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10
Dalessandro, E.; Rainer, M.; Bragaglia, A. +6 more
Aims: The Scutum complex in the inner disk of the Galaxy hosts a number of young clusters and associations of red supergiant stars that are heavily obscured by dust extinction. These stars are important tracers of the recent star formation and chemical enrichment history in the inner Galaxy.
Methods: Within the SPA Large Programme at the…
A comparison of multiple Rosetta data sets and 3D model calculations of 67P/Churyumov-Gerasimenko coma around equinox (May 2015)
Jorda, L.; Altwegg, K.; Kührt, E. +23 more
We have used the latest available shape model for gas and dust simulations of the inner coma of comet 67P/Churyumov-Gerasimenko for the period around May 2015 (equinox). We compare results from a purely insolation-driven model with a complementary set of observations made by ROSINA, VIRTIS, MIRO, and OSIRIS within the same period. The observations…
Stellar Overdensity in the Local Arm in Gaia DR2
Matsunaga, Noriyuki; Kawata, Daisuke; Honma, Mareki +4 more
Using the cross-matched data of Gaia DR2 and the 2MASS Point Source Catalog, we investigated the surface density distribution of stars aged ∼1 Gyr in the thin disk in the range of 90° ≤ l ≤ 270°. We selected 4654 stars above the turnoff corresponding to the age ∼1 Gyr, that fall within a small box region in the color-magnitude diagram, (J - K
Examining the Class B to A Shift of the 7.7 µm PAH Band with the NASA Ames PAH IR Spectroscopic Database
Boersma, Christiaan; Shannon, Matthew J.
We present insights into the behavior of the astronomical 7.7 µm polycyclic aromatic hydrocarbon (PAH) emission complex as gleaned from analyzing synthesized spectra, utilizing the data and tools from the NASA Ames PAH IR Spectroscopic Database. We specifically study the influence of PAH size, charge, aliphatic content, and nitrogen substitu…