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High resolution spectroscopy of C/2022 E3 (ZTF)

Presentation #322.08 in the session Comets (Poster)

Published onOct 23, 2023
High resolution spectroscopy of C/2022 E3 (ZTF)

The study of comets offers a unique opportunity to investigate the physical and chemical processes that occurred during the early stages of the formation and evolution of our Sun and Solar System. Formed at large distance from the Sun, comets have been preserved at low temperatures since their birth. Most of the species in the coma are the products of physical and chemical processes acting on the parent molecules in the nucleus or in the inner coma. The study of their emission lines could then provide a large information on the physical phenomena occurring in the coma and on the composition of the nucleus. C/2022 E3 (ZTF) is a Long-period comet from the Oort cloud that was discovered by the Zwicky Transient Facility (ZTF) on 2 March 2022. The comet reached its Perihelion on 12 January 2023, at a distance of 1.11 AU, and the closest approach to Earth was on 1 February 2023, at a distance of 0.28 AU. We obtained three high resolution optical spectra of comet ZTF on 15 December 2022, 4 January and 2 February 2023 by using the High Accuracy Radial velocity Planet Searcher (HARPS-North) echelle spectrograph installed on the 360-cm Telescopio Nazionale Galileo (TNG). This instrument covers the wavelength range between 383 and 693 nm, with a resolving power of 115000. We reduced the spectrum by performing absolute calibration, sky subtraction and dust-continuum normalization using IRAF routines. We present a high-resolution emission line catalog of comet C/2022 E3, following [1]. The catalog is used as a baseline to measure the fluxes of given bands and/or lines (e.g., CN, [OI]) through well-established IRAF routines. Cometary production rates are then estimated using a Haser model [2] and used to investigate the chemical composition of the coma.


[1] P.Cambianica, et al., 2021, A&A, 656, A160. [2] G.Munaretto, et al., 2023, Planet.Space Scie., 230, 105664.

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