RT Journal Article
T1 Visible and near-infrared observations of interstellar comet 2I/Borisov with the 10.4-m GTC and the 3.6-m TNG telescopes
A1 Leon, Julia de
A1 Licandro Goldaracena, Javier
A1 Fuente Marcos, Carlos de la
A1 Fuente Marcos, Raúl de la
A1 Lara López, Luisa M.
A1 Moreno, Fernando
A1 Pinilla-Alonso, Noemi
A1 Serra-Ricart, M.
A1 De Pra, Mario
A1 Tozzi, G. P.
A1 Souza-Feliciano, Ana Carolina de
A1 Popescu, M.
A1 Scarpa, R.
A1 Font Serra, J.
A1 Geier, S.
A1 Lorenzi, V.
A1 Harutyunyan, A.
A1 Cabrera-Lavers, A.
AB In this work, we present the results of an observational study of 2I/Borisov carried out with the 10.4-m Gran Telescopio Canarias (GTC) and the 3.6-m Telescopio Nazionale Galileo (TNG), both telescopes located at the Roque de Los Muchachos Observatory, in the island of La Palma (Spain). The study includes images in the visible and near-infrared, as well as visible spectra in the 3600–9200 Å wavelength range. N-body simulations were also performed to explore its orbital evolution and Galactic kinematic context. The comet’s dust continuum and near-infrared colours are compatible with those observed for Solar system comets. From its visible spectrum on the nights of 2019 September 24 and 26, we measured CN gas production rates Q(CN) = (2.3 ± 0.4) × 1024 mol s−1 and Q(CN) = (9.5 ± 0.2) × 1024 mol s−1, respectively, in agreement with measurements reported by other authors on similar nights. We also obtained an upper limit for the C2 production rate of Q(C2) < (4.5 ± 0.1) × 1024 mol s−1. Dust modelling results indicate a moderate dust production rate of ∼50 kg s−1 at heliocentric distance rh = 2.6 au, with a differential power-law dust size distribution of index ∼–3.4, within the range reported for many comet comae. Our simulations show that the Galactic velocity of 2I/Borisov matches well that of known stars in the solar neighbourhood and also those of more distant regions of the Galactic disc.
PB Oxford University Press
SN 0035-8711
YR 2020
FD 2020
LK https://hdl.handle.net/20.500.14352/8125
UL https://hdl.handle.net/20.500.14352/8125
LA eng
NO This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
NO OP-ERDF-ESF (UE)
NO Ministerio de Economía y Competitividad (MINECO)
NO Ministerio de Ciencia e Innovación (MCIU)
DS Docta Complutense
RD 21 dic 2025