A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system

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A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system. / Bonomo, Aldo S.; Zeng, Li; Damasso, Mario; Leinhardt, Zoë M.; Justesen, Anders B.; Lopez, Eric; Lund, Mikkel N.; Malavolta, Luca; Silva Aguirre, Victor; Buchhave, Lars A.; Corsaro, Enrico; Denman, Thomas; Lopez-Morales, Mercedes; Mills, Sean M.; Mortier, Annelies; Rice, Ken; Sozzetti, Alessandro; Vanderburg, Andrew; Affer, Laura; Arentoft, Torben; Benbakoura, Mansour; Bouchy, François; Christensen-Dalsgaard, Jørgen; Collier Cameron, Andrew; Cosentino, Rosario; Dressing, Courtney D.; Dumusque, Xavier; Figueira, Pedro; Fiorenzano, Aldo F.M.; García, Rafael A.; Handberg, Rasmus; Harutyunyan, Avet; Johnson, John A.; Kjeldsen, Hans; Latham, David W.; Lovis, Christophe; Lundkvist, Mia S.; Mathur, Savita; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Motalebi, Fatemeh; Nascimbeni, Valerio; Nava, Chantanelle; Pepe, Francesco; Phillips, David F.; Piotto, Giampaolo; Poretti, Ennio; Sasselov, Dimitar; Ségransan, Damien.

I: Nature Astronomy, Bind 3, Nr. 5, 01.05.2019, s. 416-423.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisLetterForskningpeer review

Harvard

Bonomo, AS, Zeng, L, Damasso, M, Leinhardt, ZM, Justesen, AB, Lopez, E, Lund, MN, Malavolta, L, Silva Aguirre, V, Buchhave, LA, Corsaro, E, Denman, T, Lopez-Morales, M, Mills, SM, Mortier, A, Rice, K, Sozzetti, A, Vanderburg, A, Affer, L, Arentoft, T, Benbakoura, M, Bouchy, F, Christensen-Dalsgaard, J, Collier Cameron, A, Cosentino, R, Dressing, CD, Dumusque, X, Figueira, P, Fiorenzano, AFM, García, RA, Handberg, R, Harutyunyan, A, Johnson, JA, Kjeldsen, H, Latham, DW, Lovis, C, Lundkvist, MS, Mathur, S, Mayor, M, Micela, G, Molinari, E, Motalebi, F, Nascimbeni, V, Nava, C, Pepe, F, Phillips, DF, Piotto, G, Poretti, E, Sasselov, D & Ségransan, D 2019, 'A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system', Nature Astronomy, bind 3, nr. 5, s. 416-423. https://doi.org/10.1038/s41550-018-0684-9

APA

Bonomo, A. S., Zeng, L., Damasso, M., Leinhardt, Z. M., Justesen, A. B., Lopez, E., ... Ségransan, D. (2019). A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system. Nature Astronomy, 3(5), 416-423. https://doi.org/10.1038/s41550-018-0684-9

CBE

Bonomo AS, Zeng L, Damasso M, Leinhardt ZM, Justesen AB, Lopez E, Lund MN, Malavolta L, Silva Aguirre V, Buchhave LA, Corsaro E, Denman T, Lopez-Morales M, Mills SM, Mortier A, Rice K, Sozzetti A, Vanderburg A, Affer L, Arentoft T, Benbakoura M, Bouchy F, Christensen-Dalsgaard J, Collier Cameron A, Cosentino R, Dressing CD, Dumusque X, Figueira P, Fiorenzano AFM, García RA, Handberg R, Harutyunyan A, Johnson JA, Kjeldsen H, Latham DW, Lovis C, Lundkvist MS, Mathur S, Mayor M, Micela G, Molinari E, Motalebi F, Nascimbeni V, Nava C, Pepe F, Phillips DF, Piotto G, Poretti E, Sasselov D, Ségransan D. 2019. A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system. Nature Astronomy. 3(5):416-423. https://doi.org/10.1038/s41550-018-0684-9

MLA

Vancouver

Bonomo AS, Zeng L, Damasso M, Leinhardt ZM, Justesen AB, Lopez E o.a. A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system. Nature Astronomy. 2019 maj 1;3(5):416-423. https://doi.org/10.1038/s41550-018-0684-9

Author

Bonomo, Aldo S. ; Zeng, Li ; Damasso, Mario ; Leinhardt, Zoë M. ; Justesen, Anders B. ; Lopez, Eric ; Lund, Mikkel N. ; Malavolta, Luca ; Silva Aguirre, Victor ; Buchhave, Lars A. ; Corsaro, Enrico ; Denman, Thomas ; Lopez-Morales, Mercedes ; Mills, Sean M. ; Mortier, Annelies ; Rice, Ken ; Sozzetti, Alessandro ; Vanderburg, Andrew ; Affer, Laura ; Arentoft, Torben ; Benbakoura, Mansour ; Bouchy, François ; Christensen-Dalsgaard, Jørgen ; Collier Cameron, Andrew ; Cosentino, Rosario ; Dressing, Courtney D. ; Dumusque, Xavier ; Figueira, Pedro ; Fiorenzano, Aldo F.M. ; García, Rafael A. ; Handberg, Rasmus ; Harutyunyan, Avet ; Johnson, John A. ; Kjeldsen, Hans ; Latham, David W. ; Lovis, Christophe ; Lundkvist, Mia S. ; Mathur, Savita ; Mayor, Michel ; Micela, Giusi ; Molinari, Emilio ; Motalebi, Fatemeh ; Nascimbeni, Valerio ; Nava, Chantanelle ; Pepe, Francesco ; Phillips, David F. ; Piotto, Giampaolo ; Poretti, Ennio ; Sasselov, Dimitar ; Ségransan, Damien. / A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system. I: Nature Astronomy. 2019 ; Bind 3, Nr. 5. s. 416-423.

Bibtex

@article{68f1eadc9b324b44ba972328b84a3017,
title = "A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system",
abstract = "Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii (R ⊕ ) range from low-density sub-Neptunes containing volatile elements 1 to higher-density rocky planets with Earth-like 2 or iron-rich 3 (Mercury-like) compositions. Such astonishing diversity in observed small exoplanet compositions may be the product of different initial conditions of the planet-formation process or different evolutionary paths that altered the planetary properties after formation 4 . Planet evolution may be especially affected by either photoevaporative mass loss induced by high stellar X-ray and extreme ultraviolet (XUV) flux 5 or giant impacts 6 . Although there is some evidence for the former 7,8 , there are no unambiguous findings so far about the occurrence of giant impacts in an exoplanet system. Here, we characterize the two innermost planets of the compact and near-resonant system Kepler-107 (ref. 9 ). We show that they have nearly identical radii (about 1.5–1.6R ⊕ ), but the outer planet Kepler-107 c is more than twice as dense (about 12.6 g cm –3 ) as the innermost Kepler-107 b (about 5.3 g cm −3 ). In consequence, Kepler-107 c must have a larger iron core fraction than Kepler-107 b. This imbalance cannot be explained by the stellar XUV irradiation, which would conversely make the more-irradiated and less-massive planet Kepler-107 b denser than Kepler-107 c. Instead, the dissimilar densities are consistent with a giant impact event on Kepler-107 c that would have stripped off part of its silicate mantle. This hypothesis is supported by theoretical predictions from collisional mantle stripping 10 , which match the mass and radius of Kepler-107 c.",
keywords = "CODE, COMPANIONS, CONVECTION, HOT SUPER-EARTHS, LIGHT CURVES, LIMB-DARKENING COEFFICIENTS, OSCILLATION FREQUENCIES, PLANETS, STARS",
author = "Bonomo, {Aldo S.} and Li Zeng and Mario Damasso and Leinhardt, {Zo{\"e} M.} and Justesen, {Anders B.} and Eric Lopez and Lund, {Mikkel N.} and Luca Malavolta and {Silva Aguirre}, Victor and Buchhave, {Lars A.} and Enrico Corsaro and Thomas Denman and Mercedes Lopez-Morales and Mills, {Sean M.} and Annelies Mortier and Ken Rice and Alessandro Sozzetti and Andrew Vanderburg and Laura Affer and Torben Arentoft and Mansour Benbakoura and Fran{\cc}ois Bouchy and J{\o}rgen Christensen-Dalsgaard and {Collier Cameron}, Andrew and Rosario Cosentino and Dressing, {Courtney D.} and Xavier Dumusque and Pedro Figueira and Fiorenzano, {Aldo F.M.} and Garc{\'i}a, {Rafael A.} and Rasmus Handberg and Avet Harutyunyan and Johnson, {John A.} and Hans Kjeldsen and Latham, {David W.} and Christophe Lovis and Lundkvist, {Mia S.} and Savita Mathur and Michel Mayor and Giusi Micela and Emilio Molinari and Fatemeh Motalebi and Valerio Nascimbeni and Chantanelle Nava and Francesco Pepe and Phillips, {David F.} and Giampaolo Piotto and Ennio Poretti and Dimitar Sasselov and Damien S{\'e}gransan",
year = "2019",
month = "5",
day = "1",
doi = "10.1038/s41550-018-0684-9",
language = "English",
volume = "3",
pages = "416--423",
journal = "Nature Astronomy",
issn = "2397-3366",
publisher = "Nature Publishing Group",
number = "5",

}

RIS

TY - JOUR

T1 - A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system

AU - Bonomo, Aldo S.

AU - Zeng, Li

AU - Damasso, Mario

AU - Leinhardt, Zoë M.

AU - Justesen, Anders B.

AU - Lopez, Eric

AU - Lund, Mikkel N.

AU - Malavolta, Luca

AU - Silva Aguirre, Victor

AU - Buchhave, Lars A.

AU - Corsaro, Enrico

AU - Denman, Thomas

AU - Lopez-Morales, Mercedes

AU - Mills, Sean M.

AU - Mortier, Annelies

AU - Rice, Ken

AU - Sozzetti, Alessandro

AU - Vanderburg, Andrew

AU - Affer, Laura

AU - Arentoft, Torben

AU - Benbakoura, Mansour

AU - Bouchy, François

AU - Christensen-Dalsgaard, Jørgen

AU - Collier Cameron, Andrew

AU - Cosentino, Rosario

AU - Dressing, Courtney D.

AU - Dumusque, Xavier

AU - Figueira, Pedro

AU - Fiorenzano, Aldo F.M.

AU - García, Rafael A.

AU - Handberg, Rasmus

AU - Harutyunyan, Avet

AU - Johnson, John A.

AU - Kjeldsen, Hans

AU - Latham, David W.

AU - Lovis, Christophe

AU - Lundkvist, Mia S.

AU - Mathur, Savita

AU - Mayor, Michel

AU - Micela, Giusi

AU - Molinari, Emilio

AU - Motalebi, Fatemeh

AU - Nascimbeni, Valerio

AU - Nava, Chantanelle

AU - Pepe, Francesco

AU - Phillips, David F.

AU - Piotto, Giampaolo

AU - Poretti, Ennio

AU - Sasselov, Dimitar

AU - Ségransan, Damien

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii (R ⊕ ) range from low-density sub-Neptunes containing volatile elements 1 to higher-density rocky planets with Earth-like 2 or iron-rich 3 (Mercury-like) compositions. Such astonishing diversity in observed small exoplanet compositions may be the product of different initial conditions of the planet-formation process or different evolutionary paths that altered the planetary properties after formation 4 . Planet evolution may be especially affected by either photoevaporative mass loss induced by high stellar X-ray and extreme ultraviolet (XUV) flux 5 or giant impacts 6 . Although there is some evidence for the former 7,8 , there are no unambiguous findings so far about the occurrence of giant impacts in an exoplanet system. Here, we characterize the two innermost planets of the compact and near-resonant system Kepler-107 (ref. 9 ). We show that they have nearly identical radii (about 1.5–1.6R ⊕ ), but the outer planet Kepler-107 c is more than twice as dense (about 12.6 g cm –3 ) as the innermost Kepler-107 b (about 5.3 g cm −3 ). In consequence, Kepler-107 c must have a larger iron core fraction than Kepler-107 b. This imbalance cannot be explained by the stellar XUV irradiation, which would conversely make the more-irradiated and less-massive planet Kepler-107 b denser than Kepler-107 c. Instead, the dissimilar densities are consistent with a giant impact event on Kepler-107 c that would have stripped off part of its silicate mantle. This hypothesis is supported by theoretical predictions from collisional mantle stripping 10 , which match the mass and radius of Kepler-107 c.

AB - Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii (R ⊕ ) range from low-density sub-Neptunes containing volatile elements 1 to higher-density rocky planets with Earth-like 2 or iron-rich 3 (Mercury-like) compositions. Such astonishing diversity in observed small exoplanet compositions may be the product of different initial conditions of the planet-formation process or different evolutionary paths that altered the planetary properties after formation 4 . Planet evolution may be especially affected by either photoevaporative mass loss induced by high stellar X-ray and extreme ultraviolet (XUV) flux 5 or giant impacts 6 . Although there is some evidence for the former 7,8 , there are no unambiguous findings so far about the occurrence of giant impacts in an exoplanet system. Here, we characterize the two innermost planets of the compact and near-resonant system Kepler-107 (ref. 9 ). We show that they have nearly identical radii (about 1.5–1.6R ⊕ ), but the outer planet Kepler-107 c is more than twice as dense (about 12.6 g cm –3 ) as the innermost Kepler-107 b (about 5.3 g cm −3 ). In consequence, Kepler-107 c must have a larger iron core fraction than Kepler-107 b. This imbalance cannot be explained by the stellar XUV irradiation, which would conversely make the more-irradiated and less-massive planet Kepler-107 b denser than Kepler-107 c. Instead, the dissimilar densities are consistent with a giant impact event on Kepler-107 c that would have stripped off part of its silicate mantle. This hypothesis is supported by theoretical predictions from collisional mantle stripping 10 , which match the mass and radius of Kepler-107 c.

KW - CODE

KW - COMPANIONS

KW - CONVECTION

KW - HOT SUPER-EARTHS

KW - LIGHT CURVES

KW - LIMB-DARKENING COEFFICIENTS

KW - OSCILLATION FREQUENCIES

KW - PLANETS

KW - STARS

UR - http://www.scopus.com/inward/record.url?scp=85065653360&partnerID=8YFLogxK

U2 - 10.1038/s41550-018-0684-9

DO - 10.1038/s41550-018-0684-9

M3 - Letter

VL - 3

SP - 416

EP - 423

JO - Nature Astronomy

JF - Nature Astronomy

SN - 2397-3366

IS - 5

ER -