A search for the infrared spectroscopic signature of hot Jupiter planets

Lucas, P. W.; Roche, P. F.

doi:10.1046/j.1365-8711.2002.05786.x

Cited by 11 publications

(10 citation statements)

References 31 publications

(38 reference statements)

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“…The second star (HD 283750b) is moving on the circular orbit with a period of 1.788011 d, its mass is estimated to be about 0.17 M or less, and it is consistent with being a brown dwarf. The infrared spectroscopic study by Lucas & Roche (2002) allows one to consider HD 283750b as a hot Jupiter planet with mass of 50 M Jup . Griffin et al (1985) presented the history of the study of HD 283750.…”

Section: V833 Tau: General Propertiesmentioning

confidence: 99%

Wavelet analysis of the long-term activity of V833 Tau

Stepanov,

Bondar',

Katsova

et al. 2020

Preprint

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The bulk of available stellar activity observations is frequently checked for the manifestation of signs in comparison with the known characteristic of solar magnetic modulation. The problem is that stellar activity records are usually an order of magnitude shorter than available observations of solar activity variation. Therefore, the resolved time scales of stellar activity are insufficient to decide reliably that a cyclic variation for a particular star is similar to the well-known 11-yr sunspot cycles. As a result, recent studies report several stars with double or multiple cycles which serve to challenge the underlying theoretical understanding. This is why a consistent method to separate 'true' cycles from stochastic variations is required. In this paper, we suggest that a conservative method, based on the best practice of wavelet analysis previously applied to the study of solar activity, for studying and interpreting the longest available stellar activity record -photometric monitoring of V833 Tau for more than 100 years. We find that the observed variations of V833 Tau with timescales of 2 -50 yr should be comparable with the known quasi-periodic solar mid-term variations, whereas the true cycle of V833 Tau, if it exists, should be of about a century or even longer. We argue that this conclusion does not contradict the expectations from stellar dynamo theory.

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Section: V833 Tau: General Propertiesmentioning

confidence: 99%

Wavelet analysis of the long-term activity of V833 Tau

Stepanov,

Bondar',

Katsova

et al. 2020

Preprint

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“…The small planet-to-star flux ratios (bottom frame, Fig. 2.1) make it impossible to attain static data (like onetime observations) from the planet (see Lucas and Roche, 2002, for one such attempt).…”

Section: Observations Of the Planetmentioning

confidence: 99%

Transit Spectroscopy of the Extrasolar Planet HD 209458b: The Search for Water

Rojo

Harrington²,

Zeehandelaar³

et al. 2004

AIP Conference Proceedings

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This dissertation describes an attempt to detect water in the atmosphere of the extrasolar planet HD 209458b using transit spectroscopy. It first discusses the importance of water detection and reviews the state of knowledge about extrasolar planets. This review discusses the main statistical trends and describes the detection methods employed to this date. The importance of the transiting planets and the many measurements of the known ones are also discussed.A radiative transfer model designed and built specifically for this project predicts, given a planetary temperature/pressure/composition profile, the dependence in wavelength of the stellar spectrum modulation due to a transiting planet. A total of 352 spectra around 1.8 µm were obtained on four nights (three in transit) of observations on August 3-4, September 26, and October 3 of 2002 using ISAAC at the Very Large Telescope.Correlating the modeled modulation with the infrared spectra yields a nondetection of water in the atmosphere of HD 209458b. It is found that the nondetection is due to an unfortunate choice of observing parameters and conditions that made it impossible to reach the required sensitivity. Nonetheless, the results are scaled with synthetic spectra to place strong limits on the planetary system configurations for which the observing parameters and telluric conditions would have yielded a successful detection. None of the 10 other known transiting planets would be detectable with the choice of parameters and conditions for this observation.A quantitative model of an improved observing strategy for future observations of this kind is developed. The improvements include: airmass and timing constraints, the simultaneous observation of a calibrator star, and a new method to find the optimal wavelength range.The data-reduction process includes several original techniques that were developed during this work, such as a method to remove fringes from flat fields and several methods to correct for telluric absorption, among others.

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“…As a result, there have been numerous efforts to detect directly IR spectroscopic features from the planetary atmosphere. Lucas & Roche (2002) They searched for the spectroscopic edges arising from H20 and CH4, neither of which are expected to be present in the stellar spectrum. Their typical 3a upper limits for water features were at the level of one part in several hundred.…”

Section: Infrared Emissionmentioning

confidence: 99%

A Review of the Current Status of Follow-Up Techniques to Study Known Extrasolar Planets

Charbonneau¹

2004

Symp. - Int. Astron. Union

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Abstract. I present a review of observational efforts to study known extrasolar planets by methods that are complementary to the radial velocity technique. I describe the current state of attempts to detect and characterize such planets by astrometry, by reflected light, by thermal emission, by transit photometry, by atmospheric transmission spectroscopy, by planet-induced chromospheric activity, and by long-wavelength radio emission. With a few exceptions, these efforts have yielded only upper limits. Nonetheless, the diversity and vivacity of these pursuits has rapidly pushed many of these techniques into the realm where realistic models of the planets and their atmospheres can now be confronted.

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A search for the infrared spectroscopic signature of hot Jupiter planets

Cited by 11 publications

References 31 publications

Wavelet analysis of the long-term activity of V833 Tau

Wavelet analysis of the long-term activity of V833 Tau

Transit Spectroscopy of the Extrasolar Planet HD 209458b: The Search for Water

A Review of the Current Status of Follow-Up Techniques to Study Known Extrasolar Planets

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