NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters

Jean C. Costes; Christopher A. Watson; Claudia Belardi; Ian P. Braker; Matthew R. Burleigh; Sarah L. Casewell; Philipp Eigmüller; Maximilian N. Günther; James A. G. Jackman; Louise D. Nielsen; Maritza G. Soto; Oliver Turner; David R. Anderson; Daniel Bayliss; François Bouchy; Joshua T. Briegal; Edward M. Bryant; Juan Cabrera; Alexander Chaushev; Szilard Csizmadia; Anders Erikson; Samuel Gill; Edward Gillen; Michael R. Goad; Simon Hodgkin; Matthew J. Hooton; James S. Jenkins; James McCormac; Maximiliano Moyano; Didier Queloz; Heike Rauer; Liam Raynard; Alexis M. S. Smith; Andrew P. G. Thompson; Rosanna H. Tilbrook; Stephane Udry; Jose I. Vines; Richard G. West; Peter J. Wheatley

doi:10.1093/mnras/stz3140

NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters

Jean C. Costes, Christopher A. Watson, Claudia Belardi, Ian P. Braker, Matthew R. Burleigh, Sarah L. Casewell, Philipp Eigmüller, Maximilian N. Günther, James A. G. Jackman, Louise D. Nielsen, Maritza G. Soto, Oliver Turner, David R. Anderson, Daniel Bayliss, François Bouchy, Joshua T. Briegal, Edward M. Bryant, Juan Cabrera, Alexander Chaushev, Szilard CsizmadiaAnders Erikson, Samuel Gill, Edward Gillen, Michael R. Goad, Simon Hodgkin, Matthew J. Hooton, James S. Jenkins, James McCormac, Maximiliano Moyano, Didier Queloz, Heike Rauer, Liam Raynard, Alexis M. S. Smith, Andrew P. G. Thompson, Rosanna H. Tilbrook, Stephane Udry, Jose I. Vines, Richard G. West, Peter J. Wheatley

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Abstract

We report the discovery, by the Next Generation Transit Survey (NGTS), of two hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 days, respectively. The transits were independently verified by follow-up photometric observations with the SAAO 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society, Advance Access
Early online date	20 Nov 2019
DOIs	https://doi.org/10.1093/mnras/stz3140
Publication status	Early online date - 20 Nov 2019

Keywords

techniques: photometric
stars: individual: NGTS-8 and NGTS-9 planetary systems
planets and satellites: detection

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NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 1.36 MBLicence: Unspecified

http://adsabs.harvard.edu/abs/2019MNRAS.tmp.2767C

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Costes, J. C., Watson, C. A., Belardi, C., Braker, I. P., Burleigh, M. R., Casewell, S. L., Eigmüller, P., Günther, M. N., Jackman, J. A. G., Nielsen, L. D., Soto, M. G., Turner, O., Anderson, D. R., Bayliss, D., Bouchy, F., Briegal, J. T., Bryant, E. M., Cabrera, J., Chaushev, A., ... Wheatley, P. J. (2019). NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters. Monthly Notices of the Royal Astronomical Society, Advance Access. https://doi.org/10.1093/mnras/stz3140

Costes, Jean C. ; Watson, Christopher A. ; Belardi, Claudia ; Braker, Ian P. ; Burleigh, Matthew R. ; Casewell, Sarah L. ; Eigmüller, Philipp ; Günther, Maximilian N. ; Jackman, James A. G. ; Nielsen, Louise D. ; Soto, Maritza G. ; Turner, Oliver ; Anderson, David R. ; Bayliss, Daniel ; Bouchy, François ; Briegal, Joshua T. ; Bryant, Edward M. ; Cabrera, Juan ; Chaushev, Alexander ; Csizmadia, Szilard ; Erikson, Anders ; Gill, Samuel ; Gillen, Edward ; Goad, Michael R. ; Hodgkin, Simon ; Hooton, Matthew J. ; Jenkins, James S. ; McCormac, James ; Moyano, Maximiliano ; Queloz, Didier ; Rauer, Heike ; Raynard, Liam ; Smith, Alexis M. S. ; Thompson, Andrew P. G. ; Tilbrook, Rosanna H. ; Udry, Stephane ; Vines, Jose I. ; West, Richard G. ; Wheatley, Peter J. / NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters. In: Monthly Notices of the Royal Astronomical Society, Advance Access. 2019.

@article{7bee9c2c5f1f48059eb2c67af034fb37,

title = "NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters",

abstract = "We report the discovery, by the Next Generation Transit Survey (NGTS), of two hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 days, respectively. The transits were independently verified by follow-up photometric observations with the SAAO 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.",

keywords = "techniques: photometric, stars: individual: NGTS-8 and NGTS-9 planetary systems, planets and satellites: detection",

author = "Costes, {Jean C.} and Watson, {Christopher A.} and Claudia Belardi and Braker, {Ian P.} and Burleigh, {Matthew R.} and Casewell, {Sarah L.} and Philipp Eigm{\"u}ller and G{\"u}nther, {Maximilian N.} and Jackman, {James A. G.} and Nielsen, {Louise D.} and Soto, {Maritza G.} and Oliver Turner and Anderson, {David R.} and Daniel Bayliss and Fran{\c c}ois Bouchy and Briegal, {Joshua T.} and Bryant, {Edward M.} and Juan Cabrera and Alexander Chaushev and Szilard Csizmadia and Anders Erikson and Samuel Gill and Edward Gillen and Goad, {Michael R.} and Simon Hodgkin and Hooton, {Matthew J.} and Jenkins, {James S.} and James McCormac and Maximiliano Moyano and Didier Queloz and Heike Rauer and Liam Raynard and Smith, {Alexis M. S.} and Thompson, {Andrew P. G.} and Tilbrook, {Rosanna H.} and Stephane Udry and Vines, {Jose I.} and West, {Richard G.} and Wheatley, {Peter J.}",

year = "2019",

month = nov,

day = "20",

doi = "10.1093/mnras/stz3140",

language = "English",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

}

Costes, JC , Watson, CA, Belardi, C, Braker, IP, Burleigh, MR, Casewell, SL, Eigmüller, P, Günther, MN, Jackman, JAG, Nielsen, LD, Soto, MG, Turner, O, Anderson, DR, Bayliss, D, Bouchy, F, Briegal, JT, Bryant, EM, Cabrera, J, Chaushev, A, Csizmadia, S, Erikson, A, Gill, S, Gillen, E, Goad, MR, Hodgkin, S, Hooton, MJ, Jenkins, JS, McCormac, J, Moyano, M, Queloz, D, Rauer, H, Raynard, L, Smith, AMS, Thompson, APG, Tilbrook, RH, Udry, S, Vines, JI, West, RG & Wheatley, PJ 2019, 'NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters', Monthly Notices of the Royal Astronomical Society, Advance Access. https://doi.org/10.1093/mnras/stz3140

NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters. / Costes, Jean C.; Watson, Christopher A.; Belardi, Claudia; Braker, Ian P.; Burleigh, Matthew R.; Casewell, Sarah L.; Eigmüller, Philipp; Günther, Maximilian N.; Jackman, James A. G.; Nielsen, Louise D.; Soto, Maritza G.; Turner, Oliver; Anderson, David R.; Bayliss, Daniel; Bouchy, François; Briegal, Joshua T.; Bryant, Edward M.; Cabrera, Juan; Chaushev, Alexander; Csizmadia, Szilard; Erikson, Anders; Gill, Samuel; Gillen, Edward; Goad, Michael R.; Hodgkin, Simon; Hooton, Matthew J.; Jenkins, James S.; McCormac, James; Moyano, Maximiliano; Queloz, Didier; Rauer, Heike; Raynard, Liam; Smith, Alexis M. S.; Thompson, Andrew P. G.; Tilbrook, Rosanna H.; Udry, Stephane; Vines, Jose I.; West, Richard G.; Wheatley, Peter J.

In: Monthly Notices of the Royal Astronomical Society, Advance Access, 20.11.2019.

Research output: Contribution to journal › Article

TY - JOUR

T1 - NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters

AU - Costes, Jean C.

AU - Watson, Christopher A.

AU - Belardi, Claudia

AU - Braker, Ian P.

AU - Burleigh, Matthew R.

AU - Casewell, Sarah L.

AU - Eigmüller, Philipp

AU - Günther, Maximilian N.

AU - Jackman, James A. G.

AU - Nielsen, Louise D.

AU - Soto, Maritza G.

AU - Turner, Oliver

AU - Anderson, David R.

AU - Bayliss, Daniel

AU - Bouchy, François

AU - Briegal, Joshua T.

AU - Bryant, Edward M.

AU - Cabrera, Juan

AU - Chaushev, Alexander

AU - Csizmadia, Szilard

AU - Erikson, Anders

AU - Gill, Samuel

AU - Gillen, Edward

AU - Goad, Michael R.

AU - Hodgkin, Simon

AU - Hooton, Matthew J.

AU - Jenkins, James S.

AU - McCormac, James

AU - Moyano, Maximiliano

AU - Queloz, Didier

AU - Rauer, Heike

AU - Raynard, Liam

AU - Smith, Alexis M. S.

AU - Thompson, Andrew P. G.

AU - Tilbrook, Rosanna H.

AU - Udry, Stephane

AU - Vines, Jose I.

AU - West, Richard G.

AU - Wheatley, Peter J.

PY - 2019/11/20

Y1 - 2019/11/20

N2 - We report the discovery, by the Next Generation Transit Survey (NGTS), of two hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 days, respectively. The transits were independently verified by follow-up photometric observations with the SAAO 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.

AB - We report the discovery, by the Next Generation Transit Survey (NGTS), of two hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 days, respectively. The transits were independently verified by follow-up photometric observations with the SAAO 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.

KW - techniques: photometric

KW - stars: individual: NGTS-8 and NGTS-9 planetary systems

KW - planets and satellites: detection

U2 - 10.1093/mnras/stz3140

DO - 10.1093/mnras/stz3140

M3 - Article

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -