Bibliographies thématiques / Q2 Lovejoy

Littérature scientifique sur le sujet « Q2 Lovejoy »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Q2 Lovejoy"

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Wirström, E. S., M. S. Lerner, P. Källström, A. Levinsson, A. Olivefors et E. Tegehall. « HCN observations of comets C/2013 R1 (Lovejoy) and C/2014 Q2 (Lovejoy) ». Astronomy & ; Astrophysics 588 (21 mars 2016) : A72. http://dx.doi.org/10.1051/0004-6361/201527482.

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Serra-Ricart, Miquel, et Javier Licandro. « THE ROTATION PERIOD OF C/2014 Q2 (LOVEJOY) ». Astrophysical Journal 814, no 1 (17 novembre 2015) : 49. http://dx.doi.org/10.1088/0004-637x/814/1/49.

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Biver, Nicolas, Dominique Bockelée-Morvan, Raphaël Moreno, Jacques Crovisier, Pierre Colom, Dariusz C. Lis, Aage Sandqvist, Jérémie Boissier, Didier Despois et Stefanie N. Milam. « Ethyl alcohol and sugar in comet C/2014 Q2 (Lovejoy) ». Science Advances 1, no 9 (octobre 2015) : e1500863. http://dx.doi.org/10.1126/sciadv.1500863.

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The presence of numerous complex organic molecules (COMs; defined as those containing six or more atoms) around protostars shows that star formation is accompanied by an increase of molecular complexity. These COMs may be part of the material from which planetesimals and, ultimately, planets formed. Comets represent some of the oldest and most primitive material in the solar system, including ices, and are thus our best window into the volatile composition of the solar protoplanetary disk. Molecules identified to be present in cometary ices include water, simple hydrocarbons, oxygen, sulfur, and nitrogen-bearing species, as well as a few COMs, such as ethylene glycol and glycine. We report the detection of 21 molecules in comet C/2014 Q2 (Lovejoy), including the first identification of ethyl alcohol (ethanol, C2H5OH) and the simplest monosaccharide sugar glycolaldehyde (CH2OHCHO) in a comet. The abundances of ethanol and glycolaldehyde, respectively 5 and 0.8% relative to methanol (0.12 and 0.02% relative to water), are somewhat higher than the values measured in solar-type protostars. Overall, the high abundance of COMs in cometary ices supports the formation through grain-surface reactions in the solar system protoplanetary disk.
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Kleschonok, Valery V., Igor V. Luk'yanyk, Yury M. Gorbanev et Volodymyr I. Kashuba. « Photometric study of the C/2014 Q2 (Lovejoy) comet plasma tails ». Planetary and Space Science 164 (décembre 2018) : 1–6. http://dx.doi.org/10.1016/j.pss.2018.04.007.

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de Val-Borro, M., S. N. Milam, M. A. Cordiner, S. B. Charnley, I. M. Coulson, A. J. Remijan et G. L. Villanueva. « Measuring molecular abundances in comet C/2014 Q2 (Lovejoy) using the APEX telescope ». Monthly Notices of the Royal Astronomical Society 474, no 1 (27 octobre 2017) : 1099–107. http://dx.doi.org/10.1093/mnras/stx2802.

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Venkataramani, Kumar, Satyesh Ghetiya, Shashikiran Ganesh, U. C. Joshi, Vikrant K. Agnihotri et K. S. Baliyan. « Optical spectroscopy of comet C/2014 Q2 (Lovejoy) from the Mount Abu Infrared Observatory ». Monthly Notices of the Royal Astronomical Society 463, no 2 (23 septembre 2016) : 2137–44. http://dx.doi.org/10.1093/mnras/stw1820.

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Dello Russo, Neil, Ronald J. Vervack, Hideyo Kawakita, Boncho P. Bonev, Michael A. DiSanti, Erika L. Gibb, Adam J. McKay et al. « Volatile Abundances, Extended Coma Sources, and Nucleus Ice Associations in Comet C/2014 Q2 (Lovejoy) ». Planetary Science Journal 3, no 1 (1 janvier 2022) : 6. http://dx.doi.org/10.3847/psj/ac323c.

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Abstract High-resolution infrared spectra of comet C/2014 Q2 Lovejoy were acquired with NIRSPEC at the W. M. Keck Observatory on two post-perihelion dates (UT 2015 February 2 and 3). H2O was measured simultaneously with CO, CH3OH, H2CO, CH4, C2H6, C2H4, C2H2, HCN, and NH3 on both dates, and rotational temperatures, production rates, relative abundances, H2O ortho-to-para ratios, and spatial distributions in the coma were determined. The first detection of C2H4 in a comet from ground-based observations is reported. Abundances relative to H2O for all species were found to be in the typical range compared with values for other comets in the overall population to date. There is evidence of variability in rotational temperatures and production rates on timescales that are small compared with the rotational period of the comet. Spatial distributions of volatiles in the coma suggest complex outgassing behavior. CH3OH, HCN, C2H6, and CH4 spatial distributions in the coma are consistent with direct release from associated ices in the nucleus and are peaked in a more sunward direction compared with co-measured dust. H2O spatial profiles are clearly distinct from these other four species, likely due to a sizable coma contribution from icy grain sublimation. Spatial distributions for C2H2, H2CO, and NH3 suggest substantial contributions from extended coma sources, providing further evidence for distinct origins and associations for these species in comets. CO shows a different spatial distribution compared with other volatiles, consistent with jet activity from discrete nucleus ice sources.
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Paganini, L., M. J. Mumma, E. L. Gibb et G. L. Villanueva. « Ground-based Detection of Deuterated Water in Comet C/2014 Q2 (Lovejoy) at IR Wavelengths ». Astrophysical Journal 836, no 2 (16 février 2017) : L25. http://dx.doi.org/10.3847/2041-8213/aa5cb3.

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Shinnaka, Yoshiharu, et Hideyo Kawakita. « NITROGEN ISOTOPIC RATIO OF COMETARY AMMONIA FROM HIGH-RESOLUTION OPTICAL SPECTROSCOPIC OBSERVATIONS OF C/2014 Q2 (LOVEJOY) ». Astronomical Journal 152, no 5 (27 octobre 2016) : 145. http://dx.doi.org/10.3847/0004-6256/152/5/145.

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Paradowski, Mieczyslaw Leszek. « A new method of determining brightness and size of cometary nuclei ». Monthly Notices of the Royal Astronomical Society 492, no 3 (3 janvier 2020) : 4175–88. http://dx.doi.org/10.1093/mnras/stz3597.

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ABSTRACT This paper presents a new method of determining the brightness and size of cometary nuclei that has been applied to the following 32 observed comets: 2P/Encke, 29P/Schwassmann-Wachmann 1, 102P/Shoemaker 1, 103P/Hartley 2, 168P/Hergenrother, 189P/NEAT, 260P/McNaught, 315P/LONEOS, P/2012 NJ (La Sagra), P/2013 J2 (McNaught), C/2006 S3 (LONEOS), C/2009 P1 (Garradd), C/2010 S1 (LINEAR), C/2010 X1 (Elenin), C/2011 J2 (LINEAR), C/2011 L4 (PANSTARRS), C/2011 W3 (Lovejoy), C/2012 F6 (Lemmon), C/2012 J1 (Catalina), C/2012 K1 (PANSTARRS), C/2012 S1 (ISON), C/2013 R1 (Lovejoy), C/2013 US10 (Catalina), C/2014 B1 (Schwartz), C/2014 E2 (Jacques), C/2014 Q2 (Lovejoy), C/2015 F4 (Jacques), C/2015 V2 (Johnson), C/2015 ER61 (PANSTARRS), C/2015 VL62 (Lemmon-Yeung-PANSTARRS), C/2016 A8 (LINEAR), and C/2017 O1 (ASASSN). The method consists in fitting the exponential decay function to the measured coma brightness in the aperture radius range from 0.5 to 2 pixels, and extrapolating this function to 0 pixels to obtain nuclear brightness. The R-band absolute nuclear magnitude RN(1, 1, 0), and the logarithm of the nucleus diameter DN expressed in kilometres, follow a linear dependence with the absolute total visual magnitude H. This dependence is of the form RN(1, 1, 0) = 12.5943 + 0.648H, and log DN[km] = 1.2415 − 0.13H. Comet 2P/Encke does not fit this dependence due to its high nuclear density of 800 kg m−3 (Sosa & Fernández 2009). The mean bulk density of the observed comets (except 2P/Encke) is 453 ± 29 kg m−3. The accuracy of the method in determining the brightness of comet nuclei at a level of 1σ is 8 per cent.
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Thèses sur le sujet "Q2 Lovejoy"

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Faggi, Sara. « HIRES/E-ELT astrobiology science case. Cosmogonic indicators in comets : Targeting a quantum leap using new-generation high-resolution echelle spectrometers ». Doctoral thesis, 2017. http://hdl.handle.net/2158/1076920.

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Tesi di dottorato in Fisica e Astronomia di Sara Faggi. Ricerca svolta nell'ambito dell'astrobiologia, studio del sistema solare e focalizzata su comete. Questo lavoro di dottorato ha avuto come obbiettivo lo sviluppo di un caso scientifico per uno spettrografo di nuova generazione, riguardante l'origine dell'acqua sulla Terra. - Sara Faggi Ph.D. thesis in Physics and Astronomy. This research focused on cometary science related to astrobiology and solar system exploration. The main aim of this project was to develop a science case for a new generation high resolution spectrograph, regarding the origin of oceans water on our Earth..
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