NON-DETECTION OF THE PUTATIVE SUBSTELLAR COMPANION TO HD 149382

@article{Norris2011NONDETECTIONOT,
  title={NON-DETECTION OF THE PUTATIVE SUBSTELLAR COMPANION TO HD 149382},
  author={John M. Norris and Jason T. Wright and Richard Alan Wade and Suvrath Mahadevan and S. J. Gettel},
  journal={The Astrophysical Journal},
  year={2011},
  volume={743},
  pages={88}
}
It has been argued that a substellar companion may significantly influence the evolution of the progenitors of subdwarf B (sdB) stars. Recently, the bright sdB star HD 149382 has been claimed to host a substellar (possibly planetary) companion with a period of 2.391 days. This has important implications for the evolution of the progenitors of sdB stars as well as the source of the UV excess seen in elliptical galaxies. In order to verify this putative companion, we made 10 radial velocity… Expand

Figures and Tables from this paper

Low-mass stellar and substellar companions to sdB stars
It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an ongoing project weExpand
Hot subluminous stars
Spectroscopic analyses of blue horizontal branch stars, subluminous B- and O-stars are reviewed. These classes of stars trace stellar evolution from the horizontal branch towards the white dwarfExpand
Hot subdwarfs: Small stars marking important events in stellar evolution: Ludwig Biermann Award Lecture 2014
Hot subdwarfs are considered to be the compact helium cores of red giants which lost almost their entire hydrogen envelope. What causes this enormous mass loss is still unclear. Binary interactionsExpand
A search for transiting planets around hot subdwarfs
Context. Hot subdwarfs experienced strong mass loss on the Red Giant Branch (RGB) and are now hot and small He-burning objects. Such stars constitute excellent opportunities to address the questionExpand
RUPRECHT 147: THE OLDEST NEARBY OPEN CLUSTER AS A NEW BENCHMARK FOR STELLAR ASTROPHYSICS
Ruprecht 147 is a hitherto unappreciated open cluster that holds great promise as a standard in fundamental stellar astrophysics. We have conducted a radial velocity survey of astrometric candidatesExpand
Speaking with one voice: simulations and observations discuss the common envelope α parameter
We present a comparative study between the results of most hydrodynamic simulations of the common envelope binary interaction to date and observations of post-common envelope binaries. The goal isExpand

References

SHOWING 1-10 OF 29 REFERENCES
DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE HOT SUBDWARF STAR HD 149382—THE DECISIVE INFLUENCE OF SUBSTELLAR OBJECTS ON LATE STELLAR EVOLUTION
Substellar objects, like planets and brown dwarfs orbiting stars, are by-products of the star formation process. The evolution of their host stars may have an enormous impact on these smallExpand
Hot subdwarfs in binary systems and the nature of their unseen companions
A large fraction of the sdB stars reside in short period binaries. It is therefore clear that binary evolution plays an important role in the still unsolved problem of hot subdwarf formation. Here weExpand
The origin of subdwarf B stars – I. The formation channels
Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium-core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingly clear fromExpand
How to Make a Singleton sdB Star via Accelerated Stellar Evolution
Many hot subdwarf B stars (sdBs) are in close binaries, and the favored formation channels for subdwarfs rely on mass transfer in a binary system to strip a core He-burning star of its envelope.Expand
HERMES High‐Resolution Spectroscopy of HD 149382—Where Did the Planet Go?
A close substellar companion has been claimed to orbit the bright sdB star HD 149382 with a period of 2.391 d. In order to check this important discovery we gathered 26 high resolution spectra overExpand
The origin of subdwarf B stars – II
We have carried out a detailed binary population synthesis (BPS) study of the formation of subdwarf B (sdB) stars and related objects (sdO, sdOB stars) using the latest version of the BPS codeExpand
A Radial Velocity Study of Composite-spectra Hot Subdwarf Stars with the Hobby-Eberly Telescope
Many hot subdwarf stars show composite spectral energy distributions indicative of cool main-sequence (MS) companions. Binary population synthesis (BPS) models demonstrate such systems can be formedExpand
The Dearth of UV-Bright Stars in M32: Implications for Stellar Evolution Theory*
Using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, we have obtained deep, far-ultraviolet images of the compact elliptical galaxy M32. When combined with earlierExpand
Radial Velocity Confirmation of a Binary Detected from Pulse Timings
A periodic variation in the pulse timings of the pulsating hot subdwarf B (sdB) star CS 1246 was recently discovered via the observed minus calculated (O–C) diagram and suggests the presence of aExpand
Binaries discovered by the Muchfuss Project : SDSS J08205+0008— an eclipsing subdwarf B binary with a brown dwarf companion
Hot subdwarf B stars (sdBs) are extreme horizontal branch stars believed to originate from close binary evolution. Indeed about half of the known sdB stars are found in close binaries with periodsExpand
...
1
2
3
...