J/AJ/159/239ivo://CDS.VizieR/J/AJ/159/239doi:10.26093/cds/vizier.51590239CDSGuo X.Crossfield I.J.M.Dragomir D.Kosiarek M.R.Lothringer J.,Mikal-Evans T.Rosenthal L.Benneke B.Knutson H.A.Dalba P.A.,Kempton E.M.R.Henry G.W.McCullough P.R.Barman T.Blunt S.,Chontos A.Fortney J.Fulton B.J.Hirsch L.Howard A.W.Isaacson H.,Matthews J.Mocnik T.Morley C.Petigura E.A.Weiss L.M.2020-11-26T11:25:38Z2020-07-01T10:13:41ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frexoplanetsinfrared-astronomyspectroscopyradial-velocitystellar-radiiinfrared-photometryeffective-temperatureRecent years have seen increasing interest in the characterization of sub-Neptune-sized planets because of their prevalence in the Galaxy, contrasted with their absence in our solar system. HD97658 is one of the brightest stars hosting a planet of this kind, and we present the transmission spectrum of this planet by combining four Hubble Space Telescope transits, 12 Spitzer/IRAC transits, and eight Microvariability and Oscillations of Stars Telescope (MOST) transits of this system. Our transmission spectrum has a higher signal-to-noise ratio than those from previous works, and the result suggests that the slight increase in transit depth from wavelength 1.1-1.7{mu}m reported in previous works on the transmission spectrum of this planet is likely systematic. Nonetheless, our atmospheric modeling results are inconclusive, as no model provides an excellent match to our data. Nonetheless, we find that atmospheres with high C/O ratios (C/O~>0.8) and metallicities of ~>100 solar metallicity are favored. We combine the mid-transit times from all of the new Spitzer and MOST observations and obtain an updated orbital period of P=9.489295{+/-}0.000005, with a best-fit transit time center at T0=2456361.80690{+/-}0.00038(BJD). No transit timing variations are found in this system. We also present new measurements of the stellar rotation period (34{+/-}2days) and stellar activity cycle (9.6yr) of the host star HD97658. Finally, we calculate and rank the Transmission Spectroscopy Metric of all confirmed planets cooler than 1000K and with sizes between 1R_{Earth}_ and 4R_{Earth}_. We find that at least a third of small planets cooler than 1000K can be well characterized using James Webb Space Telescope, and of those, HD97658b is ranked fifth, meaning that it remains a high-priority target for atmospheric characterization.2020AJ....159..239Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/239CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/503/601 : HD17156 transit photometry & radial velocities (Barbieri+,2009)J/A+A/520/A66 : CoRoT-8b light and RV curves (Borde+, 2010)J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJ/747/35 : HST/WFC3 transit observation of GJ1214b (Berta+, 2012)J/ApJ/772/L2 : Keck/HIRES radial velocities for HD 97658 (Dragomir+, 2013)J/ApJ/786/2 : Spitzer photometric time series of HD 97658 (Van Grootel+,2014)J/AJ/150/169 : Radial velocities of HD 6434 (Hinkel+, 2015)J/ApJ/848/34 : CATalog of Stellar Unified Properties (Hinkel+, 2017)J/AJ/153/191 : Transiting planet GJ 1132 (Southworth+, 2017)J/AJ/155/66 : Stroemgren photometric observations GJ436b (Lothringer+, 2018)J/A+A/631/A90 : K2-138 HARPS radial velocities (Lopez+, 2019)J/AJ/157/33 : Radial velocity exploration of {sigma} Eridani (Mawet+, 2019)J/AJ/157/192 : Radial velocities and transit times for KOI 4 (Chontos+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/239https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/239http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/239https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/239https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/239http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/239GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/239/table11 (Transmission Spectroscopy Metric of confirmed planets with R_{Earth}_<R_planet_<4R_{Earth}_, and cooler than 1000K)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/239/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/239/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/239/table11?GETtext/xml+votable180.050000true258.82889064.96390690.0055555555555555564/922 934 935 944 945 946 5/3645 3646 3647 3692 3694 3695 3704 3706 3730 3731 3732 3733 3734 3792 6/267 275 279 282 285 313 318 328 397 404 413 437 450 464 467 1032 1036 1052 4247 4268 4273 4296 4322 4330 4332 4351 4629 4632 4673 4677 4679 4687 4688 4696 4697 4698 4700 4720 4816 4867 4875 4897 14278 14573 14577 14578 14579 14730 14731 14733 14734 14735 14744 14746 14749 14750 14751 14772 14773 14774 14792 14794 14828 14830 14914 14915 14917 14918 14919 14940 14941 14942 15040 15041 15044 15057 15060 15061 15062 15153 15154 15155 15156 15157 15158 15160 15172 15173 15174 15178 15200 15232 16847 17149 18018 18022 18023 18039 18112 18147 18163 18164 18171 18222 18328 18329 18344 18345 18350 18361 18451 18459 18469 18470 18473 18490 18496 18532 18536 18542 18565 18567 18569 18572 18578 18580 18585 18628 18632 18704 18726 18785 18800 18881 22065 23531 24256 24340 25312 25427 25428 25434 25452 25454 25463 25543 25548 25551 25554 25557 25562 25565 25577 25585 25624 25627 25631 25673 25696 25699 25710 25723 25725 25756 25757 25783 25795 25797 26114 26170 26246 26253 26258 26275 26290 26292 26296 26928 26940 26944 26959 26961 26969 26977 26986 26991 26999 27001 27025 27076 27079 27084 27085 27393 27681 27684 27704 27787 28400 29730 31216 33210 33386 33972 36015 36614 37453 39080 40250 42984 44370 44431 44463 44474 44512 45372 46128 47717 48113 48501 48503https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/239?format=asciiInfrareddefaultJ/AJ/159/239/table6Radial velocities of HD97658recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2450463/2458560] Barycentric Julian Date, TDB systemdtime.epochdoubleRVel[-20.58/14.62] Radial Velocitym/sphys.veloc;pos.heliocentricfloate_RVel[0.91/7.78] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatSHK[0.149/0.379] Stellar activity indicator, Calcium H & K lines (1)phot.flux;arith.ratiofloatInstInstrument used (2)instr.setupcharJ/AJ/159/239/table11Transmission Spectroscopy Metric of confirmed planets with R_{Earth}_<R_planet_<4R_{Earth}_, and cooler than 1000KSimbadNameSimbad column added by the CDSmeta.idcharNamePlanet namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRstar[0.12/2.94] Stellar radiussolRadphys.size.radiusfloatTeff[2559/7070] Stellar effective temperatureKphys.temperature.effectiveintJmag[3.981/14.858] J band magnitudemagphot.mag;em.IR.JfloatRplanet[1.04/3.96] Planet radius(6.3781x10+6m)phys.size.radiusfloatMplanet[0.64/5995] Planet mass(5.97236x10+24kg)phys.massfloatTeq[173/999] Equilibrium planet temperatureKphys.temperatureintPer[0.46/638] Planet orbital perioddtime.perioddoubleTSM[0/630] Transmission Spectroscopy Metric (1)stat.snrfloat_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.main