Precise masses for the transiting planetary system HD 106315 with HARPS

S.~C.~C. Barros; H. Gosselin; J. Lillo-Box; D. Bayliss; E. Delgado Mena; B. Brugger; A. Santerne; D.~J. Armstrong; V. Adibekyan; J.~D. Armstrong; D. Barrado; J. Bento; I. Boisse; A.~S. Bonomo; F. Bouchy; D.~J.~A. Brown; W.~D. Cochran; A. Collier Cameron; M. Deleuil; O. Demangeon; R.~F. Díaz; A. Doyle; X. Dumusque; D. Ehrenreich; N. Espinoza; F. Faedi; J.~P. Faria; P. Figueira; E. Foxell; G. Hébrard; S. Hojjatpanah; J. Jackman; M. Lendl; R. Ligi; C. Lovis; C. Melo; O. Mousis; J.~J. Neal; H.~P. Osborn; D. Pollacco; N.~C. Santos; R. Sefako; A. Shporer; S.~G. Sousa; A.~H.~M.~J. Triaud; S. Udry; A. Vigan; A. Wyttenbach

doi:10.1051/0004-6361/201731276

Precise masses for the transiting planetary system HD 106315 with HARPS

S.~C.~C. Barros, H. Gosselin, J. Lillo-Box, D. Bayliss, E. Delgado Mena, B. Brugger, A. Santerne, D.~J. Armstrong, V. Adibekyan, J.~D. Armstrong, D. Barrado, J. Bento, I. Boisse, A.~S. Bonomo, F. Bouchy, D.~J.~A. Brown, W.~D. Cochran, A. Collier Cameron, M. Deleuil, O. DemangeonR.~F. Díaz, A. Doyle, X. Dumusque, D. Ehrenreich, N. Espinoza, F. Faedi, J.~P. Faria, P. Figueira, E. Foxell, G. Hébrard, S. Hojjatpanah, J. Jackman, M. Lendl, R. Ligi, C. Lovis, C. Melo, O. Mousis, J.~J. Neal, H.~P. Osborn, D. Pollacco, N.~C. Santos, R. Sefako, A. Shporer, S.~G. Sousa, A.~H.~M.~J. Triaud, S. Udry, A. Vigan, A. Wyttenbach

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P$_b$ 9.55 and P$_c$ 21.06 days, and radii of r$_b$ = 2.44 plusmn 0.17 R$_⊕$ and r$_c$ = 4.35 plusmn 0.23 R$_⊕$ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses.
Aims: We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability.
Methods: We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters.
Results: We estimate the mass of HD 106315b to be 12.6 plusmn 3.2 M$_⊕$ and the density to be 4.7 plusmn 1.7 g cm$^-3$, while for HD 106315c we estimate a mass of 15.2 plusmn 3.7 M$_⊕$ and a density of 1.01 plusmn 0.29 g cm$^-3$. Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another.
Conclusions: We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29 and the water mass fraction to be 10-50 An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 198.C-0168.

Original language	English
Pages (from-to)	A25
Journal	Astronomy and Astrophysics
Volume	608
DOIs	https://doi.org/10.1051/0004-6361/201731276
Publication status	Published - 1 Dec 2017

Keywords

techniques: photometric
planets and satellites: detection
planets and satellites: fundamental parameters
planets and satellites: composition
stars: individual: HD 106315
techniques: radial velocities

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Barros, S. C. C., Gosselin, H., Lillo-Box, J., Bayliss, D., Delgado Mena, E., Brugger, B., Santerne, A., Armstrong, D. J., Adibekyan, V., Armstrong, J. D., Barrado, D., Bento, J., Boisse, I., Bonomo, A. S., Bouchy, F., Brown, D. J. A., Cochran, W. D., Collier Cameron, A., Deleuil, M., ... Wyttenbach, A. (2017). Precise masses for the transiting planetary system HD 106315 with HARPS. Astronomy and Astrophysics, 608, A25. https://doi.org/10.1051/0004-6361/201731276

@article{ab89270d4e23474486ce071834156b80,

title = "Precise masses for the transiting planetary system HD 106315 with HARPS",

abstract = "Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P$_b$ 9.55 and P$_c$ 21.06 days, and radii of r$_b$ = 2.44 plusmn 0.17 R$_⊕$ and r$_c$ = 4.35 plusmn 0.23 R$_⊕$ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. Aims: We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. Methods: We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. Results: We estimate the mass of HD 106315b to be 12.6 plusmn 3.2 M$_⊕$ and the density to be 4.7 plusmn 1.7 g cm$^-3$, while for HD 106315c we estimate a mass of 15.2 plusmn 3.7 M$_⊕$ and a density of 1.01 plusmn 0.29 g cm$^-3$. Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. Conclusions: We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29 and the water mass fraction to be 10-50 An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 198.C-0168. ",

keywords = "techniques: photometric, planets and satellites: detection, planets and satellites: fundamental parameters, planets and satellites: composition, stars: individual: HD 106315, techniques: radial velocities",

author = "S.~C.~C. Barros and H. Gosselin and J. Lillo-Box and D. Bayliss and {Delgado Mena}, E. and B. Brugger and A. Santerne and D.~J. Armstrong and V. Adibekyan and J.~D. Armstrong and D. Barrado and J. Bento and I. Boisse and A.~S. Bonomo and F. Bouchy and D.~J.~A. Brown and W.~D. Cochran and {Collier Cameron}, A. and M. Deleuil and O. Demangeon and R.~F. D{\'i}az and A. Doyle and X. Dumusque and D. Ehrenreich and N. Espinoza and F. Faedi and J.~P. Faria and P. Figueira and E. Foxell and G. H{\'e}brard and S. Hojjatpanah and J. Jackman and M. Lendl and R. Ligi and C. Lovis and C. Melo and O. Mousis and J.~J. Neal and H.~P. Osborn and D. Pollacco and N.~C. Santos and R. Sefako and A. Shporer and S.~G. Sousa and A.~H.~M.~J. Triaud and S. Udry and A. Vigan and A. Wyttenbach",

year = "2017",

month = dec,

day = "1",

doi = "10.1051/0004-6361/201731276",

language = "English",

volume = "608",

pages = "A25",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Barros, SCC, Gosselin, H, Lillo-Box, J, Bayliss, D, Delgado Mena, E, Brugger, B, Santerne, A, Armstrong, DJ, Adibekyan, V, Armstrong, JD, Barrado, D, Bento, J, Boisse, I, Bonomo, AS, Bouchy, F, Brown, DJA, Cochran, WD, Collier Cameron, A, Deleuil, M, Demangeon, O, Díaz, RF, Doyle, A, Dumusque, X, Ehrenreich, D, Espinoza, N, Faedi, F, Faria, JP, Figueira, P, Foxell, E, Hébrard, G, Hojjatpanah, S, Jackman, J, Lendl, M, Ligi, R, Lovis, C, Melo, C, Mousis, O, Neal, JJ, Osborn, HP, Pollacco, D, Santos, NC, Sefako, R, Shporer, A, Sousa, SG, Triaud, AHMJ, Udry, S, Vigan, A & Wyttenbach, A 2017, 'Precise masses for the transiting planetary system HD 106315 with HARPS', Astronomy and Astrophysics, vol. 608, pp. A25. https://doi.org/10.1051/0004-6361/201731276

TY - JOUR

T1 - Precise masses for the transiting planetary system HD 106315 with HARPS

AU - Barros, S.~C.~C.

AU - Gosselin, H.

AU - Lillo-Box, J.

AU - Bayliss, D.

AU - Delgado Mena, E.

AU - Brugger, B.

AU - Santerne, A.

AU - Armstrong, D.~J.

AU - Adibekyan, V.

AU - Armstrong, J.~D.

AU - Barrado, D.

AU - Bento, J.

AU - Boisse, I.

AU - Bonomo, A.~S.

AU - Bouchy, F.

AU - Brown, D.~J.~A.

AU - Cochran, W.~D.

AU - Collier Cameron, A.

AU - Deleuil, M.

AU - Demangeon, O.

AU - Díaz, R.~F.

AU - Doyle, A.

AU - Dumusque, X.

AU - Ehrenreich, D.

AU - Espinoza, N.

AU - Faedi, F.

AU - Faria, J.~P.

AU - Figueira, P.

AU - Foxell, E.

AU - Hébrard, G.

AU - Hojjatpanah, S.

AU - Jackman, J.

AU - Lendl, M.

AU - Ligi, R.

AU - Lovis, C.

AU - Melo, C.

AU - Mousis, O.

AU - Neal, J.~J.

AU - Osborn, H.~P.

AU - Pollacco, D.

AU - Santos, N.~C.

AU - Sefako, R.

AU - Shporer, A.

AU - Sousa, S.~G.

AU - Triaud, A.~H.~M.~J.

AU - Udry, S.

AU - Vigan, A.

AU - Wyttenbach, A.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P$_b$ 9.55 and P$_c$ 21.06 days, and radii of r$_b$ = 2.44 plusmn 0.17 R$_⊕$ and r$_c$ = 4.35 plusmn 0.23 R$_⊕$ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. Aims: We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. Methods: We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. Results: We estimate the mass of HD 106315b to be 12.6 plusmn 3.2 M$_⊕$ and the density to be 4.7 plusmn 1.7 g cm$^-3$, while for HD 106315c we estimate a mass of 15.2 plusmn 3.7 M$_⊕$ and a density of 1.01 plusmn 0.29 g cm$^-3$. Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. Conclusions: We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29 and the water mass fraction to be 10-50 An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 198.C-0168.

AB - Context. The multi-planetary system HD 106315 was recently found in K2 data. The planets have periods of P$_b$ 9.55 and P$_c$ 21.06 days, and radii of r$_b$ = 2.44 plusmn 0.17 R$_⊕$ and r$_c$ = 4.35 plusmn 0.23 R$_⊕$ . The brightness of the host star (V = 9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. Aims: We obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. Methods: We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. Results: We estimate the mass of HD 106315b to be 12.6 plusmn 3.2 M$_⊕$ and the density to be 4.7 plusmn 1.7 g cm$^-3$, while for HD 106315c we estimate a mass of 15.2 plusmn 3.7 M$_⊕$ and a density of 1.01 plusmn 0.29 g cm$^-3$. Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. Conclusions: We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29 and the water mass fraction to be 10-50 An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 198.C-0168.

KW - techniques: photometric

KW - planets and satellites: detection

KW - planets and satellites: fundamental parameters

KW - planets and satellites: composition

KW - stars: individual: HD 106315

KW - techniques: radial velocities

U2 - 10.1051/0004-6361/201731276

DO - 10.1051/0004-6361/201731276

M3 - Article

SN - 0004-6361

VL - 608

SP - A25

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

Precise masses for the transiting planetary system HD 106315 with HARPS

Abstract

Keywords

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