Asteroid (16) Psyche’s primordial shape: A possible Jacobi ellipsoid
M. Ferrais
(1)
,
P. Vernazza
(2)
,
L. Jorda
(2)
,
N. Rambaux
(3)
,
J. Hanuš
(4)
,
B. Carry
(5)
,
F. Marchis
(6)
,
M. Marsset
(7)
,
M. Viikinkoski
(8)
,
M. Brož
(4)
,
R. Fetick
(2)
,
A. Drouard
(9)
,
T. Fusco
,
M. Birlan
(3)
,
E. Podlewska-Gaca
(10)
,
E. Jehin
(11)
,
P. Bartczak
(10)
,
J. Berthier
(3)
,
J. Castillo-Rogez
(12)
,
F. Cipriani
(13)
,
F. Colas
(3)
,
G. Dudziński
(14)
,
C. Dumas
(15)
,
J. Ďurech
(4)
,
M. Kaasalainen
(16)
,
A. Kryszczynska
(14)
,
P. Lamy
(2)
,
H. Le Coroller
(17)
,
A. Marciniak
(10)
,
T. Michalowski
(10)
,
P. Michel
(18)
,
T. Santana-Ros
(14)
,
P. Tanga
(18)
,
F. Vachier
(3)
,
Arthur Vigan
(2)
,
O. Witasse
(13)
,
Bin Yang
(19)
1
STAR -
Space Sciences, Technologies and Astrophysics Research Institute
2 LAM - Laboratoire d'Astrophysique de Marseille
3 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
4 Astronomical Institute of Charles University
5 ESAC - European Space Astronomy Centre
6 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
7 ARC - Astrophysics Research Centre [Belfast]
8 TUT - Tampere University of Technology [Tampere]
9 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
10 UAM - Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań
11 ESO - European Southern Observatory
12 JPL - Jet Propulsion Laboratory
13 ESTEC - European Space Research and Technology Centre
14 Astronomical Observatory [Poznan]
15 Laboratoire associé de Reconnaissance cellulaire et amélioration des plantes
16 Department of Mathematics [Tampere]
17 OHP - Observatoire de Haute-Provence
18 LAGRANGE - Joseph Louis LAGRANGE
19 Northeastern University [Shenyang]
2 LAM - Laboratoire d'Astrophysique de Marseille
3 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
4 Astronomical Institute of Charles University
5 ESAC - European Space Astronomy Centre
6 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
7 ARC - Astrophysics Research Centre [Belfast]
8 TUT - Tampere University of Technology [Tampere]
9 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
10 UAM - Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań
11 ESO - European Southern Observatory
12 JPL - Jet Propulsion Laboratory
13 ESTEC - European Space Research and Technology Centre
14 Astronomical Observatory [Poznan]
15 Laboratoire associé de Reconnaissance cellulaire et amélioration des plantes
16 Department of Mathematics [Tampere]
17 OHP - Observatoire de Haute-Provence
18 LAGRANGE - Joseph Louis LAGRANGE
19 Northeastern University [Shenyang]
M. Ferrais
- Fonction : Auteur
- PersonId : 794053
- ORCID : 0000-0002-0535-652X
P. Vernazza
- Fonction : Auteur
- PersonId : 738592
- IdHAL : pierre-vernazza
- ORCID : 0000-0002-2564-6743
- IdRef : 112732976
L. Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
J. Hanuš
- Fonction : Auteur
- PersonId : 767859
- ORCID : 0000-0002-2934-3723
B. Carry
- Fonction : Auteur
- PersonId : 759634
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- IdRef : 142621641
F. Marchis
- Fonction : Auteur
- PersonId : 755708
- ORCID : 0000-0001-7016-7277
M. Marsset
- Fonction : Auteur
- PersonId : 780537
- ORCID : 0000-0001-8617-2425
M. Viikinkoski
- Fonction : Auteur
- PersonId : 767796
- ORCID : 0000-0001-8601-9164
M. Brož
- Fonction : Auteur
- PersonId : 767992
- ORCID : 0000-0003-2763-1411
T. Fusco
- Fonction : Auteur
M. Birlan
- Fonction : Auteur
- PersonId : 738892
- IdHAL : mirel-birlan
- ORCID : 0000-0003-3495-8535
- IdRef : 149395191
E. Jehin
- Fonction : Auteur
- PersonId : 759915
- ORCID : 0000-0001-8923-488X
F. Colas
- Fonction : Auteur
- PersonId : 742285
- IdHAL : jean-francois-colas
- ORCID : 0000-0002-0764-5042
- IdRef : 05759872X
C. Dumas
- Fonction : Auteur
- PersonId : 737838
- IdHAL : claire-dumas
- ORCID : 0000-0002-1224-6054
- IdRef : 124651275
A. Marciniak
- Fonction : Auteur
- PersonId : 739835
- IdHAL : alexandre-marciniak
- ORCID : 0000-0002-1703-0041
- IdRef : 197340954
P. Michel
- Fonction : Auteur
- PersonId : 18347
- IdHAL : patrick-michel
- ORCID : 0000-0002-0884-1993
T. Santana-Ros
- Fonction : Auteur
- PersonId : 767993
- ORCID : 0000-0002-0143-9440
F. Vachier
- Fonction : Auteur
- PersonId : 1238798
- IdHAL : frederic-vachier
- ORCID : 0000-0002-4289-4466
- IdRef : 133776670
Arthur Vigan
- Fonction : Auteur
- PersonId : 22058
- IdHAL : arthur-vigan
- ORCID : 0000-0002-5902-7828
- IdRef : 145014010
Résumé
Context. Asteroid (16) Psyche is the largest M-type asteroid in the main belt and the target of the NASA Psyche mission. It is also the only asteroid of this size (D > 200 km) known to be metal rich. Although various hypotheses have been proposed to explain the rather unique physical properties of this asteroid, a perfect understanding of its formation and bulk composition is still missing.Aims. We aim to refine the shape and bulk density of (16) Psyche and to perform a thorough analysis of its shape to better constrain possible formation scenarios and the structure of its interior.Methods. We obtained disk-resolved VLT/SPHERE/ZIMPOL images acquired within our ESO large program (ID 199.C-0074), which complement similar data obtained in 2018. Both data sets offer a complete coverage of Psyche’s surface. These images were used to reconstruct the three-dimensional (3D) shape of Psyche with two independent shape modeling algorithms (MPCD and ADAM). A shape analysis was subsequently performed, including a comparison with equilibrium figures and the identification of mass deficit regions.Results. Our 3D shape along with existing mass estimates imply a density of 4.20 ± 0.60 g cm−3, which is so far the highest for a solar system object following the four telluric planets. Furthermore, the shape of Psyche presents small deviations from an ellipsoid, that is, prominently three large depressions along its equator. The flatness and density of Psyche are compatible with a formation at hydrostatic equilibrium as a Jacobi ellipsoid with a shorter rotation period of ∼3h. Later impacts may have slowed down Psyche’s rotation, which is currently ∼4.2 h, while also creating the imaged depressions.Conclusions. Our results open the possibility that Psyche acquired its primordial shape either after a giant impact while its interior was already frozen or while its interior was still molten owing to the decay of the short-lived radionuclide 26Al.
Domaines
Astrophysique [astro-ph]Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Asteroid (16) Psyche’s primordial shape: A possible Jacobi ellipsoid
|
Résumé |
en
Context. Asteroid (16) Psyche is the largest M-type asteroid in the main belt and the target of the NASA Psyche mission. It is also the only asteroid of this size (D > 200 km) known to be metal rich. Although various hypotheses have been proposed to explain the rather unique physical properties of this asteroid, a perfect understanding of its formation and bulk composition is still missing.Aims. We aim to refine the shape and bulk density of (16) Psyche and to perform a thorough analysis of its shape to better constrain possible formation scenarios and the structure of its interior.Methods. We obtained disk-resolved VLT/SPHERE/ZIMPOL images acquired within our ESO large program (ID 199.C-0074), which complement similar data obtained in 2018. Both data sets offer a complete coverage of Psyche’s surface. These images were used to reconstruct the three-dimensional (3D) shape of Psyche with two independent shape modeling algorithms (MPCD and ADAM). A shape analysis was subsequently performed, including a comparison with equilibrium figures and the identification of mass deficit regions.Results. Our 3D shape along with existing mass estimates imply a density of 4.20 ± 0.60 g cm−3, which is so far the highest for a solar system object following the four telluric planets. Furthermore, the shape of Psyche presents small deviations from an ellipsoid, that is, prominently three large depressions along its equator. The flatness and density of Psyche are compatible with a formation at hydrostatic equilibrium as a Jacobi ellipsoid with a shorter rotation period of ∼3h. Later impacts may have slowed down Psyche’s rotation, which is currently ∼4.2 h, while also creating the imaged depressions.Conclusions. Our results open the possibility that Psyche acquired its primordial shape either after a giant impact while its interior was already frozen or while its interior was still molten owing to the decay of the short-lived radionuclide 26Al.
|
Auteur(s) |
M. Ferrais
1
, P. Vernazza
2
, L. Jorda
2
, N. Rambaux
3
, J. Hanuš
4
, B. Carry
5
, F. Marchis
6
, M. Marsset
7
, M. Viikinkoski
8
, M. Brož
4
, R. Fetick
2
, A. Drouard
9
, T. Fusco
, M. Birlan
3
, E. Podlewska-Gaca
10
, E. Jehin
11
, P. Bartczak
10
, J. Berthier
3
, J. Castillo-Rogez
12
, F. Cipriani
13
, F. Colas
3
, G. Dudziński
14
, C. Dumas
15
, J. Ďurech
4
, M. Kaasalainen
16
, A. Kryszczynska
14
, P. Lamy
2
, H. Le Coroller
17
, A. Marciniak
10
, T. Michalowski
10
, P. Michel
18
, T. Santana-Ros
14
, P. Tanga
18
, F. Vachier
3
, Arthur Vigan
2
, O. Witasse
13
, Bin Yang
19
1
STAR -
Space Sciences, Technologies and Astrophysics Research Institute
( 483944 )
- Université de Liège
- Belgique
2
LAM -
Laboratoire d'Astrophysique de Marseille
( 179944 )
- Pôle de l'Étoile Site de Château-Gombert 38, rue Frédéric Joliot-Curie 13388 Marseille cedex 13
- France
3
IMCCE -
Institut de Mécanique Céleste et de Calcul des Ephémérides
( 541700 )
- 77 av Denfert-Rochereau - 75014 Paris
- France
4
Astronomical Institute of Charles University
( 150764 )
- Astronomicky Ustav UK , Faculty of Mathematics and Physics, V Holesovickach 2 , 180 00 Praha 8
- Tchéquie
5
ESAC -
European Space Astronomy Centre
( 231736 )
- Camino bajo del Castillo, s/n, Urbanización Villafranca del Castillo,, Villanueva de la Cañada, E-28692 Madrid
- Espagne
6
IMCCE -
Institut de Mécanique Céleste et de Calcul des Ephémérides
( 153 )
- 77 av Denfert-Rochereau 75014 Paris
- France
7
ARC -
Astrophysics Research Centre [Belfast]
( 166941 )
- School of Mathematics and Physics, QUB, Belfast, County Antrim BT7 INN
- Irlande
8
TUT -
Tampere University of Technology [Tampere]
( 11598 )
- Kalevantie 4, FI-33014
- Finlande
9
DAPNIA -
Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
( 40222 )
- France
10
UAM -
Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań
( 307219 )
- Uniwersytet im. Adama Mickiewicza w Poznaniu ul. Wieniawskiego 1 61-712 Poznań
- Pologne
11
ESO -
European Southern Observatory
( 300079 )
- Karl-Schwarzchild Str. 2 D-85748 Garching bei München
- Allemagne
12
JPL -
Jet Propulsion Laboratory
( 61129 )
- 4800 Oak Grove Drive, Pasadena, CA 91109-8099, USA
- États-Unis
13
ESTEC -
European Space Research and Technology Centre
( 152768 )
- Keplerlaan 1, 2201 Noordwijk
- Pays-Bas
14
Astronomical Observatory [Poznan]
( 150747 )
- ul. Sloneczna 36, PL-60-286 Poznan
- Pologne
15
Laboratoire associé de Reconnaissance cellulaire et amélioration des plantes
( 1005239 )
- France
16
Department of Mathematics [Tampere]
( 174026 )
- Tampere University of Technology, PO Box 553, FI-33101 Tampere
- Finlande
17
OHP -
Observatoire de Haute-Provence
( 494 )
- 04870 ST MICHEL L OBSERVATOIRE
- France
18
LAGRANGE -
Joseph Louis LAGRANGE
( 179867 )
- Boulevard de l'Observatoire B.P. 4229 06304 Nice Cedex 04 - France
- France
19
Northeastern University [Shenyang]
( 206771 )
- 3-11, Wenhua Road, Heping District, Shenyang 110819
- Chine
|
Volume |
638
|
Date de publication |
2020-06
|
Page/Identifiant |
L15
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Vulgarisation |
Non
|
Nom de la revue |
|
Langue du document |
Anglais
|
Date de publication électronique |
2020-06-29
|
Domaine(s) |
|
Mots-clés |
en
minor planets, asteroids: general, asteroids: individual: (16) Psyche, methods: observational, techniques: high angular resolution
|
ADS Id | 2020A&A...638L..15F |
DOI | 10.1051/0004-6361/202038100 |
Origine :
Publication financée par une institution
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