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Fig. 6


H-band spectrum of CVSO 30 c (lower left) compared to several known planetary candidates and background objects (subplots A, D, E). The triangular shape of the H-band (A), with red linear fits guiding the eye, indicates that it is not a background galaxy, but a sub-stellar companion. Beta Pic b has approximately the same luminosity and temperature (Chilcote et al. 2015) but a different surface gravity, hence about twice the mass of CVSO 30 c. As shown (C), the Drift-Phoenix models indicate that the H-band becomes less steep with temperature. This means that CVSO 30 c is even slightly lower in temperature than β Pic b. In the upper left panel another candidate is shown, detected at 4.3′′ from the A1 star HD 35367, which is about 0.5 mag brighter in the K-band than CVSO 30 c, but is obviously located in the background. In addition, the H-band (D) and K-band (E) of CT Cha b and 2M 0441 Bb, the best-fitting comparison objects, are given in K-band. These two and CVSO 30 c are given in (D, E) with identical offsets in H-band and K-band. Additionally, the best-fitting giants and a sample of late-type dwarfs is shown for comparison. References and individual reduced comparison values are given in Table 6. Low-resolution spectra of free-floating planetary candidates are not shown, but can be found in Martín et al. (2001).

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