The potassium absorption on HD189733b and HD209458b

Abstract

In this work, we investigate the potassium excess absorption around 7699A of the exoplanets HD189733b and HD209458b. For this purpose, we used high spectral resolution transit observations acquired with the 2 x 8.4m Large Binocular Telescope (LBT) and the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI). For a bandwidth of 0.8A, we present a detection > 7-sigma with an absorption level of 0.18% for HD189733b. Applying the same analysis to HD209458b, we can set 3-sigma upper limit of 0.09%, even though we do not detect a K- excess absorption. The investigation suggests that the K- feature is less present in the atmosphere of HD209458b than in the one of HD189733b. This comparison confirms previous claims that the atmospheres of these two planets must have fundamentally different properties.

arXiv commentAccepted in M.N.R.A.S, https://doi.org/10.1093/mnrasl/slz123

References in corpus (32)

• Detection of an Extrasolar Planet Atmosphere
• Theoretical Transmission Spectra During Extrasolar Giant Planet Transits
• Sodium Absorption From the Exoplanetary Atmosphere of HD189733b Detected in the Optical Transmission Spectrum
• The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations
• Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph
• Transmission Spectra of Three-Dimensional Hot Jupiter Model Atmospheres
• Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
• Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b
• An extended hydrogen envelope of the extremely hot giant exoplanet KELT-9b
• HST/STIS Optical Transit Transmission Spectra of the hot-Jupiter HD209458b
• Identification of Absorption Features in an Extrasolar Planet Atmosphere
• PEPSI: The high-resolution echelle spectrograph and polarimeter for the Large Binocular Telescope
• An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet
• On the Indirect Detection of Sodium in the Atmosphere of the Planetary Companion to HD 209458
• Gran Telescopio Canarias OSIRIS Transiting Exoplanet Atmospheric Survey: Detection of potassium in XO-2b from narrowband spectrophotometry
• Determining atmospheric conditions at the terminator of the hot-Jupiter HD209458b
• Stellar Diameters and Temperatures VI. High angular resolution measurements of the transiting exoplanet host stars HD 189733 and HD 209458 and implications for models of cool dwarfs
• Detection of sodium in the atmosphere of WASP-69b
• Simulating the cloudy atmospheres of HD 209458 b and HD 189733 b with the 3D Met Office Unified Model
• Atmospheric dynamics and the variable transit of KELT-9 b
• The mineral clouds on HD 209458b and HD189733b
• The center-to-limb variation across the Fraunhofer lines of HD 189733; Sampling the stellar spectrum using a transiting planet
• PEPSI deep spectra. I. The Sun-as-a-star
• The effect of the stellar absorption line centre-to-limb variation on exoplanet transmission spectrum observations
• A Survey of Alkali Line Absorption in Exoplanetary Atmospheres
• The upper atmosphere of the exoplanet HD209458b revealed by the sodium D lines: Temperature-pressure profile, ionization layer, and thermosphere
• A decade of H$\alpha$ transits for HD 189733 b: stellar activity versus absorption in the extended atmosphere
• The effects of stellar activity on optical high-resolution exoplanet transmission spectra
• Exoplanetary atmospheric sodium revealed by the orbital motion. Narrow-band transmission spectroscopy of HD 189733b with UVES
• Revisiting the potassium feature of WASP-31b at high-resolution
• PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards
• Time-resolved UVES observations of a stellar flare on the planet host HD 189733 during primary transit

Cited by in corpus (17)

• Ionized calcium in the atmospheres of two ultra-hot exoplanets WASP-33b and KELT-9b
• Mass loss rate and local thermodynamic state of KELT-9 b thermosphere from the hydrogen Balmer series
• Detection of Na, K, and H$\alpha$ absorption in the atmosphere of WASP-52b using ESPRESSO
• Is there NaI in the atmosphere of HD 209458b? Effect of the centre-to-limb variation and Rossiter-McLaughlin effect in transmission spectroscopy studies
• Alkaline Exospheres of Exoplanet Systems: Evaporative Transmission Spectra
• Time-resolved rotational velocities in the upper atmosphere of WASP-33 b
• Homogeneous search for helium in the atmosphere of 11 gas giant exoplanets with SPIRou
• The PEPSI Exoplanet Transit Survey (PETS) I: Investigating the presence of a silicate atmosphere on the super-Earth 55 Cnc e
• Investigating the detectability of hydrocarbons in exoplanet atmospheres with JWST
• LRG-BEASTS: Ground-based Detection of Sodium and a Steep Optical Slope in the Atmosphere of the Highly Inflated Hot-Saturn WASP-21b
• Characterization of exoplanetary atmospheres with SLOPpy
• The widest broadband transmission spectrum (0.38-1.71 $\mu$m) of HD 189733b from ground-based chromatic Rossiter-McLaughlin observations
• Stellar activity consequence on the retrieved transmission spectra through chromatic Rossiter-McLaughlin observations
• Probing the atmosphere of HD189733b with the Na I and K I lines
• High-resolution spectroscopy and spectropolarimetry of the total lunar eclipse January 2019
• Spectral signature of atmospheric winds in high resolution transit observations
• The near-UV transit of HD 189733b with the XMM-Newton Optical Monitor