Issue |
A&A
Volume 652, August 2021
|
|
---|---|---|
Article Number | A84 | |
Number of page(s) | 29 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202140917 | |
Published online | 13 August 2021 |
Luminous efficiency of meteors derived from ablation model after assessment of its range of validity
1
University of Oldenburg, Division for Medical Radiation Physics and Space Environment, Germany
e-mail: esther.drolshagen@uni-oldenburg.de; theresa.ott@uni-oldenburg.de
2
European Space Agency, ESTEC,
Keplerlaan 1,
2201 AZ
Noordwijk, The Netherlands
3
Chair of Astronautics,
TU Munich, Germany
4
IMCCE, Observatoire de Paris, PSL Research University, CNRS UMR 8028, Sorbonne Université, France
5
Institut de Minéralogie, Physique des Matériaux et Cosmochimie (IMPMC), Muséum National d’Histoire Naturelle, CNRS UMR 7590, Sorbonne Université,
75005
Paris,
France
6
FRIPON (Fireball Recovery and InterPlanetary Observation) and Vigie-Ciel Team,
France
7
GEOPS-Géosciences, CNRS, Université Paris-Saclay,
91405,
Orsay, France
8
Service Informatique Pythéas (SIP) CNRS – OSU Institut Pythéas - UMS 3470,
Marseille, France
9
Aix Marseille Univ, CNRS, CNES, LAM,
Marseille,
France
10
INAF – Osservatorio Astrofisico di Torino – Via Osservatorio 20,
10025
Pino Torinese,
TO, Italy
11
Astronomical Institute of the Romanian Academy,
Bucharest,
040557, Romania
12
MOROI (Meteorites Orbits Reconstruction by Optical Imaging) Astronomical Institute of the Romanian Academy,
Bucharest, Romania
13
SCAMP (System for Capture of Asteroid and Meteorite Paths),
FRIPON, UK
14
Planétarium Rio Tinto Alcan / Espace pour la vie,
Montréal,
Québec, Canada
15
Réseau DOME, (Détection et Observation de Météores/Detection and Observation of Meteors), Canada
16
SPMN (SPanish Meteor Network),
FRIPON, Spain
17
Institute of Space Sciences (CSIC),
Campus UAB, Facultat de Ciències, 08193 Bellaterra,
Barcelona,
Catalonia, Spain
18
Institut d’Estudis Espacials de Catalunya (IEEC),
08034
Barcelona,
Catalonia, Spain
19
FRIPON-Belgium, Belgium
20
Royal Belgian Institute for Space Aeronomy,
Brussels, Belgium
21
Natural History Museum,
Burgring 7,
1010
Vienna, Austria
22
FRIPON-Austria, Austria
23
Università degli Studi di Torino, Dipartimento di Fisica,
Via Pietro Giuria 1,
10125
Torino,
TO, Italy
24
INAF 0– Osservatorio di Astrofisica e Scienza dello Spazio Via Piero Gobetti 93/3,
40129
Bologna,
BO, Italy
25
INAF – Istituto di Astrofisica e Planetologia Spaziali Via del Fosso del Cavaliere 100,
00133
Roma,
RM, Italy
26
CNR – Istituto di Fisica Applicata Nello Carrara,
Via Madonna del Piano,
10 50019
Sesto Fiorentino (FI), Italy
27
Space sciences, Technologies Astrophysics Research (STAR) Institute, Université de Liège,
Liège
4000, Belgium
28
Università degli Studi di Firenze – Dipartimento di Scienze della Terra,
Via Giorgio La Pira, 4,
50121
Firenze,
FI, Italy
29
Natural History Museum,
Cromwell Road,
London, UK
30
Dep. Física Aplicada I, Escuela de Ingeniería de Bilbao, Universidad del País Vasco/Euskal Herriko Unibertsitatea,
48013
Bilbao, Spain
31
Aula EspaZio Gela, Escuela de Ingeniería de Bilbao, Universidad del País Vasco/Euskal Herriko Unibertsitatea,
48013
Bilbao, Spain
32
FRIPON-Netherlands, European Space Agency, SCI-SC,
Keplerlaan 1,
2201 AZ
Noordwijk, The Netherlands
33
Osservatorio Astronomico del Righi,
Via Mura delle Chiappe 44R,
16136
Genova,
GE, Italy
34
Departament de Química, Universitat Autònoma de Barcelona,
08193
Bellaterra,
Catalonia, Spain
Received:
29
March
2021
Accepted:
20
May
2021
Context. The luminous efficiency, τ, can be used to compute the pre-atmospheric masses of meteoroids from corresponding recorded meteor brightnesses. The derivation of the luminous efficiency is non-trivial and is subject to biases and model assumptions. This has led to greatly varying results in the last decades of studies.
Aims. The present paper aims to investigate how a reduction in various observational biases can be achieved to derive (more) reliable values for the luminous efficiency.
Methods. A total of 281 meteors observed by the Fireball Recovery and InterPlanetary Observation Network (FRIPON) are studied. The luminous efficiencies of the events are computed using an ablation-based model. The relations of τ as a function of the pre-atmospheric meteoroid velocity, ve, and mass, Me, are studied. Various aspects that could render the method less valid, cause inaccuracies, or bias the results are investigated. On this basis, the best suitable meteors were selected for luminous efficiency computations.
Results. The presented analysis shows the limits of the used method. The most influential characteristics that are necessary for reliable results for the τ computation were identified. We study the dependence of τ on the assumed meteoroid’s density, ρ, and include improved ρ-values for objects with identified meteoroid stream association. Based on the discovered individual biases and constraints we create a pre-debiased subset of 54 well-recorded events with a relative velocity change >80%, a final height <70 km, and a Knudsen number Kn < 0.01; this last value indicates that the events were observed in the continuum-flow regime. We find τ-values in the range between 0.012% and 1.1% for this pre-debiased subset and relations of τ to ve and Me of: τ=7.33⋅ve−1.10 and τ=0.28⋅Me−0.33.
Conclusions. The derived luminous efficiency of meteoroids depends on the assumed material density. Our results indicate that the applied debiasing method improves the analysis of τ from decelerated meteoroids. The underlying method is only valid for meteors in the continuum-flow regime. These events tend to have low end heights, large masses, and high deceleration.
Key words: meteorites, meteors, meteoroids / minor planets, asteroids: general / comets: general / techniques: photometric / atmospheric effects / methods: data analysis
© ESO 2021
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